JEE Questions for Physics Ray Optics Quiz 22 - MCQExams.com

Assertion The cloud in sky generally appear to be whitish.
Reason Diffraction due to cloud is efficient in equal measure at all wavelengths.
  • If both assertion and reason are true and the reason is the correct explanation of the assertion.
  • If both assertion and reason are true but reason is not the correct explanation of the assertion.
  • If assertion is true but reason is false.
  • If the assertion and reason both are false.
  • If assertion is false but reason is true.
Assertion Just before setting, the sun may appear to be elliptical. This happens due to refraction.
Reason Refraction of light ray through the atmosphere may cause different magnification in mutually perpendicular directions.
  • If both assertion and reason are true and the reason is the correct explanation of the assertion.
  • If both assertion and reason are true but reason is not the correct explanation of the assertion.
  • If assertion is true but reason is false.
  • If the assertion and reason both are false.
  • If assertion is false but reason is true.
Assertion Critical angle of light passing from glass to air is minimum for violet colour.
Reason The wavelength of violet light is greater than the light of other colours.
  • If both assertion and reason are true and the reason is the correct explanation of the assertion.
  • If both assertion and reason are true but reason is not the correct explanation of the assertion.
  • If assertion is true but reason is false.
  • If the assertion and reason both are false.
  • If assertion is false but reason is true.
Assertion We cannot produce a real image by plane or convex mirrors under any circumstances.
Reason The focal length of a convex mirror is always taken as positive.
  • If both assertion and reason are true and the reason is the correct explanation of the assertion.
  • If both assertion and reason are true but reason is not the correct explanation of the assertion.
  • If assertion is true but reason is false.
  • If the assertion and reason both are false.
  • If assertion is false but reason is true.
Assertion Diamond glitters brilliantly.
Reason Diamond does not absorb sunlight.
  • If both assertion and reason are true and the reason is the correct explanation of the assertion.
  • If both assertion and reason are true but reason is not the correct explanation of the assertion.
  • If assertion is true but reason is false.
  • If the assertion and reason both are false.
  • If assertion is false but reason is true.
A watch shows time as 3 : 25 when seen through amirror, time appeared will be
  • 8 : 35
  • 9 : 35
  • 7 : 35
  • 8 : 25
Assertion The images formed by total internal reflections are much brighter than those formed by mirrors or lenses.
ReasonThere is no loss of intensity in total internal reflection.
  • If both assertion and reason are true and the reason is the correct explanation of the assertion.
  • If both assertion and reason are true but reason is not the correct explanation of the assertion.
  • If assertion is true but reason is false.
  • If the assertion and reason both are false.
  • If assertion is false but reason is true.
Assertion The focal length of lens does not change when red light is replaced by blue light.
Reason The focal length of lens does not depends on colour of light used.
  • If both assertion and reason are true and the reason is the correct explanation of the assertion.
  • If both assertion and reason are true but reason is not the correct explanation of the assertion.
  • If assertion is true but reason is false.
  • If the assertion and reason both are false.
  • If assertion is false but reason is true.
Assertion There is no dispersion of light refracted through a rectangular glass slab.
Reason Dispersion of light is the phenomenon of splitting of a beam of white light into its constituent colours.
  • If both assertion and reason are true and the reason is the correct explanation of the assertion.
  • If both assertion and reason are true but reason is not the correct explanation of the assertion.
  • If assertion is true but reason is false.
  • If the assertion and reason both are false.
  • If assertion is false but reason is true.
Assertion All the materials always have the same colour, whether viewed by reflected light or through transmitted light.
ReasonThe colour of material does not depend on nature of light
  • If both assertion and reason are true and the reason is the correct explanation of the assertion.
  • If both assertion and reason are true but reason is not the correct explanation of the assertion.
  • If assertion is true but reason is false.
  • If the assertion and reason both are false.
  • If assertion is false but reason is true.
Assertion By roughening the surface of a glass sheet its transparency can be reduced.
ReasonGlass sheet with rough surface absorbs more light.
  • If both assertion and reason are true and the reason is the correct explanation of the assertion.
  • If both assertion and reason are true but reason is not the correct explanation of the assertion.
  • If assertion is true but reason is false.
  • If the assertion and reason both are false.
  • If assertion is false but reason is true.
Assertion By increasing the diameter of the objective of telescope, we can increase its range.
ReasonThe range of a telescope tells us how far away a star of some standard brightness can be spotted by telescope.
  • If both assertion and reason are true and the reason is the correct explanation of the assertion.
  • If both assertion and reason are true but reason is not the correct explanation of the assertion.
  • If assertion is true but reason is false.
  • If the assertion and reason both are false.
  • If assertion is false but reason is true.
Assertion For the sensitivity of a camera, its aperture should be reduced.
Reason Smaller the aperture, image focusing is also sharp.
  • If both assertion and reason are true and the reason is the correct explanation of the assertion.
  • If both assertion and reason are true but reason is not the correct explanation of the assertion.
  • If assertion is true but reason is false.
  • If the assertion and reason both are false.
  • If assertion is false but reason is true.
Assertion If objective and eye lenses of a microscope are interchanged then it can work as telescope.
Reason The objective of telescope has small focal length.
  • If both assertion and reason are true and the reason is the correct explanation of the assertion.
  • If both assertion and reason are true but reason is not the correct explanation of the assertion.
  • If assertion is true but reason is false.
  • If the assertion and reason both are false.
  • If assertion is false but reason is true.
Assertion The illuminance of an image produced by a convex lens is greater in the middle and less towards the edges.
Reason The middle part of image is formed by undeflected rays while outer part by inclined rays.
  • If both assertion and reason are true and the reason is the correct explanation of the assertion.
  • If both assertion and reason are true but reason is not the correct explanation of the assertion.
  • If assertion is true but reason is false.
  • If the assertion and reason both are false.
  • If assertion is false but reason is true.
Assertion The resolving power of a telescope is more if the diameter of the objective lens is more.
Reason Objective lens of large diameter collects more light.
  • If both assertion and reason are true and the reason is the correct explanation of the assertion.
  • If both assertion and reason are true but reason is not the correct explanation of the assertion.
  • If assertion is true but reason is false.
  • If the assertion and reason both are false.
  • If assertion is false but reason is true.
Assertion The resolving power of an electron microscope is higher than that of an optical microscope.
Reason The wavelength of electron is more than the wavelength of visible light.
  • If both assertion and reason are true and the reason is the correct explanation of the assertion.
  • If both assertion and reason are true but reason is not the correct explanation of the assertion.
  • If assertion is true but reason is false.
  • If the assertion and reason both are false.
  • If assertion is false but reason is true.
Assertion If the angles of the base of the prism are equal, then in the position of minimum deviation, the refracted ray will pass parallel to the base of prism.
Reason In the case of minimum deviation, the angle of incidence is equal to the angle of emergence.
  • If both assertion and reason are true and the reason is the correct explanation of the assertion.
  • If both assertion and reason are true but reason is not the correct explanation of the assertion.
  • If assertion is true but reason is false.
  • If the assertion and reason both are false.
  • If assertion is false but reason is true.
Assertion Dispersion of light occurs because velocity of light in a material depends upon its colour.
ReasonThe dispersive power depends only upon the material of the prism, not upon the refracting angle of the prism.
  • If both assertion and reason are true and the reason is the correct explanation of the assertion.
  • If both assertion and reason are true but reason is not the correct explanation of the assertion.
  • If assertion is true but reason is false.
  • If the assertion and reason both are false.
  • If assertion is false but reason is true.
Assertion An empty test tube dipped into water in a beaker appears silver, when viewed from a suitable direction.
Reason Due to refraction of light, the substance in water appears silvery.
  • If both assertion and reason are true and the reason is the correct explanation of the assertion.
  • If both assertion and reason are true but reason is not the correct explanation of the assertion.
  • If assertion is true but reason is false.
  • If the assertion and reason both are false.
  • If assertion is false but reason is true.
Assertion The refractive index of a prism depends only on the kind of glass of which it is made of and the colour of light
Reason The refractive index of a prism depends upon the refracting angle of the prism and the angle of minimum deviation
  • If both assertion and reason are true and the reason is the correct explanation of the assertion.
  • If both assertion and reason are true but reason is not the correct explanation of the assertion.
  • If assertion is true but reason is false.
  • If the assertion and reason both are false.
  • If assertion is false but reason is true.
Assertion It is impossible to photograph a virtual image.
Reason The rays which appear diverging from a virtual image fall on the camera and a real image is captured.
  • If both assertion and reason are true and the reason is the correct explanation of the assertion.
  • If both assertion and reason are true but reason is not the correct explanation of the assertion.
  • If assertion is true but reason is false.
  • If the assertion and reason both are false.
  • If assertion is false but reason is true.
Assertion The speed of light in a rarer medium is greater than that in a denser medium
Reason One light year equals to 9.5 × 1012 km
  • If both assertion and reason are true and the reason is the correct explanation of the assertion.
  • If both assertion and reason are true but reason is not the correct explanation of the assertion.
  • If assertion is true but reason is false.
  • If the assertion and reason both are false.
  • If assertion is false but reason is true.
Assertion The frequencies of incident, reflected and refracted beam of monochromatic light incident from one medium to another are same
Reason The incident, reflected and refracted rays are coplanar
  • If both assertion and reason are true and the reason is the correct explanation of the assertion.
  • If both assertion and reason are true but reason is not the correct explanation of the assertion.
  • If assertion is true but reason is false.
  • If the assertion and reason both are false.
  • If assertion is false but reason is true.
In an astronomical telescope in normal adjustment, a straight black line of length L is drawn on the objective lens. The eyepiece forms a real image of this line. The length of this image is l. The magnification of the telescope is

  • Physics-Ray Optics-86672.png
  • 2)
    Physics-Ray Optics-86673.png

  • Physics-Ray Optics-86674.png

  • Physics-Ray Optics-86675.png
Three lenses L1, L2, L3 are placed co-axially as shown infigure. Focal length\'s of lenses are given 30 cm, 10 cm and 5 cm respectively. If a parallel beam of light falling on lens L1 emerging L3 as a convergent beam such that it converges at the focus of L3. Distance between L1 and L2 will be
Physics-Ray Optics-86677.png
  • 40 cm
  • 30 cm
  • 20 cm
  • 10 cm
A man runs towards mirror at a speed of 15 m/s. What is the speed of his image
  • 7.5 m/s
  • 15 m/s
  • 30 m/s
  • 45 m/s
An object is placed at a point distant x from the focus of a convex lens and its image is formed at I as shown in the figure. The distances x, x\' satisfy the relation
Physics-Ray Optics-86679.png

  • Physics-Ray Optics-86680.png
  • 2)
    Physics-Ray Optics-86681.png

  • Physics-Ray Optics-86682.png

  • Physics-Ray Optics-86683.png
The diameter of the eye-ball of a normal eye is about 2.5 cm. The power of the eye lens varies from
  • 2 D to 10 D
  • 40 D to 32 D
  • 9 D to 8 D
  • 44 D to 40 D
In a thin spherical fish bowl of radius 10 cm filled with water of refractive index 4/3 there is a small fish at a distance of 4 cm from the centre C as shown in figure. Where will the image of fish appear, if seen from E
Physics-Ray Optics-86686.png
  • 5.2 cm
  • 7.2 cm
  • 4.2 cm
  • 3.2 cm

Physics-Ray Optics-86688.png
  • A distance of 0.2 m from the water surface
  • A distance of 0.6 m from the water surface
  • A distance of 0.3 m from the water surface
  • The same location of fish
A water drop in air refractes the light ray as

  • Physics-Ray Optics-86690.png
  • 2)
    Physics-Ray Optics-86691.png

  • Physics-Ray Optics-86692.png

  • Physics-Ray Optics-86693.png
Which of the following ray diagram show physically possible refraction
Physics-Ray Optics-86695.png
  • (i)
  • (ii)
  • (iii)
  • None of the above
Following figure shows the multiple reflections of a light ray along a glass corridor where the walls are either parallel or perpendicular to one another. If the angle of incidence at point P is 30°, what are the angles of reflection of the light ray at points Q R, S and T respectively
Physics-Ray Optics-86697.png
  • 30o,30o,30o,30o
  • 30o, 60o,30o, 60o
  • 30o, 60o, 60o,30o
  • 60o, 60o, 60o, 60o
When the rectangular metal tank is filled to the top with an unknown liquid, as observer with eyes level with the top of the tank can just see the corner E; a ray that refracts towards the observer at the top surface of the liquid is shown. The refractive index of the liquid will be
Physics-Ray Optics-86699.png
  • 1.2
  • 1.4
  • 1.6
  • 1.9

Physics-Ray Optics-86701.png

  • Physics-Ray Optics-86702.png
  • 2)
    Physics-Ray Optics-86703.png

  • Physics-Ray Optics-86704.png

  • Physics-Ray Optics-86705.png
A ray of light strikes a plane mirror Mat an angle of 45° as shown in the figure. After reflection, the ray passes through a prism of refractive index 1.5 whose apex angle is 4°. The total angle through which the ray is deviated is
Physics-Ray Optics-86706.png
  • 90°
  • 91°
  • 92°
  • 93°
A slab of glass, of thickness 6 cm and refractive index 1.5, is placed in front of a concave mirror, the faces of the slab being perpendicular to the principal axis of the mirror. If the radius of curvature of the mirror is 40 cm and the reflected image coincides with the object, then the distance of the object from the mirror is
  • 30 cm
  • 22 cm
  • 42 cm
  • 28 cm
A point source of light S is placed at the bottom of a vessel containing a liquid of refractive index 5/3. A person is viewing the source from above the surface. There is an opaque disc D of radius 1 cm floating on the surface of the liquid. The centre of the disc lies vertically above the source S. The liquid from the vessel is gradually drained out through a tap. The maximum height of the liquid for which the source cannot be seen at all from above is
Physics-Ray Optics-86709.png
  • 1.50 cm
  • 1.64 cm
  • 1.33 cm
  • 1.86 cm
A point object is placed mid-way between two plane mirrors distance \'a\' apart. The plane mirror forms an infinite number of images due to multiple reflection. The distance between the nth order image formed in the two mirrors is
  • na
  • 2na
  • na/2
  • n2 a
A convergent beam of light is incident on a convex mirror so as to converge to a distance 12 cm from the pole of the mirror. An inverted image of the same size is formed coincident with the virtual object. What is the focal length of the mirror
  • 24 cm
  • 12 cm
  • 6 cm
  • 3 cm
PQR is a right angled prism with other angles as 60° and 30°. Refractive index of prism is 1.5. PQ has a thin layer of liquid. Light falls normally on the face PR. For total internal reflection, maximum refractive index of liquid is
Physics-Ray Optics-86713.png
  • 1.4
  • 1.3
  • 1.2
  • 1.6
In a given direction, the intensities of the scattered light by a scattering substance for two beams of light are in the ratio of 256 : 81. The ratio of the frequency of the first beam to the frequency of the second beam is
  • 64 : 127
  • 4 : 3
  • 64 : 27
  • 2 : 1
Two thin lenses, when in contact, produce a combination of power + 10 D. When they are 0.25 m apart, the power reduces to + 6D. The focal lengths of the lenses (in m) are
  • 0.125 and 0.5
  • 0.125 and 0.125
  • 0.5 and 0.75
  • 0.125 and 0.75
The plane faces of two identical plano convex lenses, each with focal length f are pressed against each other using an optical glue to form a usual convex lens. The distance from the optical centre at which an object must be placed to obtain the image same as the size of object is

  • Physics-Ray Optics-86717.png
  • 2)
    Physics-Ray Optics-86718.png

  • Physics-Ray Optics-86719.png

  • Physics-Ray Optics-86720.png
A parallel beam of light emerges from the opposite surface of the sphere when a point source of light lies at the surface of the sphere. The refractive index of the sphere is

  • Physics-Ray Optics-86722.png
  • 2)
    Physics-Ray Optics-86723.png
  • 2

  • Physics-Ray Optics-86724.png
A ray of light makes an angle of 10° with the horizontal above it and strikes a plane mirror which is inclined at an angle θ to the horizontal. The angle 0 for which the reflected ray becomes vertical is
  • 40°
  • 50°
  • 80°
  • 100°
A thin rod of 5cm length is kept along the axis of a concave mirror of 10cm focal length such that its image is real and magnified and one end touches the rod. Its magnification will be
  • 1
  • 2
  • 3
  • 4
A telescope using light having wavelength 5000 Åand using lenses of focal 2.5 and 30 cm. If the diameter of the aperture of the objective is 10 cm, then the resolving limit and magnifying power of the telescope is respectively
  • 6.1 × 10–6 rad and 12
  • 5.0 × 10–6 rad and 12
  • 6.1 × 10–6 rad and 8.3 × 10–2
  • 5.0 × 10–6 rad and 8.3 × 10–2
A lens when placed on a plane mirror then object needle and its image coincide at 15 cm. The focal length of the lens is
Physics-Ray Optics-86729.png
  • 15 cm
  • 30 cm
  • 20 cm
  • ∞
0:0:1


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