JEE Questions for Physics Ray Optics Quiz 28 - MCQExams.com

Diameter of a piano-convex lens is 6 cm and thickness at the centre is 3 mm. If the speed of light in the material of the lens is 2 × 108 m/s, the focal length of the lens is
  • 15 cm
  • 20 cm
  • 30 cm
  • 10 cm
A point object O is placed on the principal axis of a convex lens of focal length 20 cm at a distance of 40 cm to the left of it. The diameter of the lens is 10 cm. If the eye is placed 60 cm to the right of the lens at a distance h below the principal axis, then the maximum value of h to see the image will be
  • 0
  • 5 cm
  • 2.5 cm
  • 10 cm
A luminous object is placed at a distance of 30 cm from the convex lens of focal length 20 cm. On the other side of the lens, at what distance from the lens a convex mirror of radius of curvature 10 cm be placed in order to have an upright image of the object coincident with it
  • 12 cm
  • 30 cm
  • 50 cm
  • 60 cm
Shown in the figure here is a convergent lens placed inside a cell filled with a liquid. The lens has focal length +20 cm when in air and its material has refractive index 1.50. If the liquid has refractive index1.60, the focal length of the system is
  • + 80 cm
  • – 80 cm
  • –24 cm
  • –100 cm
An isosceles prism of angle 120° has a refractive index of 1.44. Two parallel monochromatic rays enter the prism parallel to each other in air as shown. The rays emerging from the opposite faces
Physics-Ray Optics-87150.png
  • Are parallel to each other
  • Are diverging
  • Make an angle 2 sin–1 (0.with each other
  • Make an angle 2{sin–1 (0.72)–30°} with each other
A ray of light is incident on the hypotenuse of a right-angled prism after travelling parallel to the base inside the prism. Ifµ is the refractive index of thematerial of the prism, the maximum value of the base angle for which light is totally reflected from the hypotenuse is

  • Physics-Ray Optics-87152.png
  • 2)
    Physics-Ray Optics-87153.png

  • Physics-Ray Optics-87154.png

  • Physics-Ray Optics-87155.png
The refractive index of the material of the prism and liquid are 1.56 and 1.32 respectively. What will be the value of 9 for the following refraction?
Physics-Ray Optics-87157.png

  • Physics-Ray Optics-87158.png
  • 2)
    Physics-Ray Optics-87159.png

  • Physics-Ray Optics-87160.png

  • Physics-Ray Optics-87161.png
A spherical surface of radius of curvature R separates air (refractive index 1.from glass (refractive index 1.5). The centre of curvature is in the glass. A point object P placed in air is found to have a real image Q in the glass. The line PQ cuts the surface at a point O, and PO = OQ. The distance PO is equal to
  • 5 R
  • 3 R
  • 2 R
  • 1.5 R
A ray of light travels from an optically denser to rarer medium. The critical angle for the two media is C. The maximum possible deviation of the ray will be

  • Physics-Ray Optics-87165.png
  • 2)
    Physics-Ray Optics-87166.png

  • Physics-Ray Optics-87167.png

  • Physics-Ray Optics-87168.png
An astronaut is looking down on earth\'s surface from a space shuttle at an altitude of 400 km. Assuming that the astronaut\'s pupil diameter is 5 mm and the wavelength of visible light is 500 nm. The astronaut will be able to resolve linear object of the size of about
  • 0.5 m
  • 5 m
  • 50 m
  • 500 m
A small source of light is to be suspended directly above the centre of a circular table of radius R. What should be the height of the light source above the table so that the intensity of light is maximum at the edges of the table compared to any other height of the source

  • Physics-Ray Optics-87171.png
  • 2)
    Physics-Ray Optics-87172.png
  • R

  • Physics-Ray Optics-87173.png
A light source is located at P1 as shown in the figure. All sides of the polygon are equal. The intensity of illumination at P2 is I0. What will be the intensity of illumination at P3
Physics-Ray Optics-87175.png

  • Physics-Ray Optics-87176.png
  • 2)
    Physics-Ray Optics-87177.png

  • Physics-Ray Optics-87178.png

  • Physics-Ray Optics-87179.png
A point object is moving on the principal axis of a concave mirror of focal length 24 cm towards the mirror. When it is at a distance of 60 cm from the mirror, its velocity is 9cm / sec. What is the velocity of the image at that instant?
  • 5 cm / sec towards the mirror
  • 4 cm / sec towards the mirror
  • 4 cm / sec away from the mirror
  • 9 cm / sec away from the mirror
A concave mirror is placed on a horizontal table with its axis directed vertically upwards. Let O be the pole of the mirror and C its centre of curvature. A point object is placed at C. It has a real image, also located at C. If the mirror is now filled with water, the image will be
  • Real, and will remain at C
  • Real, and located at a point between C and ∞
  • Virtual and located at a point between C and O
  • Real, and located at a point between C and O
We wish to see inside an atom. Assuming the atom to have a diameter of 100 pm, this means that one must be able to resolved a width of say 10 pm. If an electron microscope is used, the minimum electron energy required is about
  • 1.5 keV
  • 15.1 keV
  • 150 keV
  • 1.5 keV
A telescope has an objective lens of 10 cm diameter and is situated at a distance of one kilometre from two objects. The minimum distance between these two objects, which can be resolved by the telescope, when the mean wavelength of light is 5000 Å, is of the order of
  • 0.5 m
  • 5 m
  • 5 mm
  • 5 cm
Two point white dots are 1 mm apart on a black paper. They are viewed by eye of pupil diameter 3 mm. Approximately, what is the maximum distance at which dots can be resolved by the eye ? [Take wavelength of light = 500 nm]
Physics-Ray Optics-87187.png
  • 6 m
  • 3m
  • 5m
  • 1m
Figure shows a cubical room ABCD with the wall CD as a plane mirror. Each side of the room is 3m. We place a camera at the midpoint of the wall AB. At what distance should the camera be focussed to photograph an object placed at A
Physics-Ray Optics-87196.png
  • 1.5 m
  • 3 m
  • 6 m
  • More than 6 m
There is an equiconvex glass lens with radius of each face as R and aµg = 3/2 and aµw = 4/3. If there is water in object space and air in image space, then the focal length is
  • 2R
  • R
  • 3 R/2
  • R2
The apparent depth of water in cylindrical water tank of diameter 2R cm is reducing at the rate of x cm/ minute when water is being drained out at a constant rate. The amount of water drained in c.c. per minute is (n1 = refractive index of air, n2 = refractive index of water)
  • xπR2n1/n2
  • xπR2 n2/n1
  • 2 πR n1/n2
  • πR2x
A concave mirror of focal length ‘f1\' is placed at a distance of ‘d1\' from a convex lens of focal length ‘f2\'. A beam of light coming from infinity and falling on this convex lens concave mirror combination returns to infinity. The distance \'d\' must equal
  • f1 + f2
  • –f1 + f2
  • 2 f1 + f2
  • –2 f1 + f2
In an experiment to find the focal length of a concave mirror a graph is drawn between the magnitudes of u and v. The graph looks like

  • Physics-Ray Optics-87207.png
  • 2)
    Physics-Ray Optics-87208.png

  • Physics-Ray Optics-87209.png

  • Physics-Ray Optics-87210.png
As the position of an object (u) reflected from a concave mirror is varied, the position of the image (v) also varies. By letting the u changes from 0 to + ∞ the graph between v versus u will be

  • Physics-Ray Optics-87212.png
  • 2)
    Physics-Ray Optics-87213.png

  • Physics-Ray Optics-87214.png

  • Physics-Ray Optics-87215.png
When light is incident on a medium at angle iand refracted into a second medium at an angle r, the graph of sin ivs sin r is as shown in the graph. From this, one can conclude that
Physics-Ray Optics-87217.png
  • Velocity of light in the second medium is 1.73 times the velocity of light in the I medium
  • Velocity of light in the I medium is 1.73 times the velocity in the II medium

  • Physics-Ray Optics-87218.png

  • Physics-Ray Optics-87219.png
The graph shows variation of v with change in u for a mirror. Points plotted above the point P on the curve are for values of v
  • Smaller then f
  • Smaller then 2f
  • Larger then 2f
  • Larger than f
The graph shows how the magnification m produced by a convex thin lens varies with image distance v. What was the focal length of the used lines?
Physics-Ray Optics-87227.png
  • b/c
  • b/ca
  • bc/a
  • c/b
Which of the following graphs show appropriate variation of refractive index µ with wavelength λ

  • Physics-Ray Optics-87229.png
  • 2)
    Physics-Ray Optics-87230.png

  • Physics-Ray Optics-87231.png

  • Physics-Ray Optics-87232.png

Physics-Ray Optics-87234.png

  • Physics-Ray Optics-87235.png
  • 2)
    Physics-Ray Optics-87236.png

  • Physics-Ray Optics-87237.png

  • Physics-Ray Optics-87238.png
Which of the following graphs is the magnification of a real image against the distance from the focus of a concave mirror

  • Physics-Ray Optics-87250.png
  • 2)
    Physics-Ray Optics-87251.png

  • Physics-Ray Optics-87252.png

  • Physics-Ray Optics-87253.png
A student measures the focal length of a convex lens by putting an object pin at a distance \'u\' from the lens and measuring the distance v of the image pin. The graph between ‘u\' and ‘v’ plotted by the student should look like

  • Physics-Ray Optics-87259.png
  • 2)
    Physics-Ray Optics-87260.png

  • Physics-Ray Optics-87261.png

  • Physics-Ray Optics-87262.png
For a small angled prism, angle of prism A, the angle of minimum deviation (δ) varies with the refractive index of the prism as shown in the graph
Physics-Ray Optics-87263.png
  • Point P corresponds to µ =1
  • Slope of the line PQ = A/2
  • Slope = A
  • None of the above statements is true
The graph between sine of angle of refraction (sin r) in medium 2 and sine of angle of incidence (sin i) in medium 1 indicates that (tan 36° = 3/4)
Physics-Ray Optics-87265.png
  • Total internal reflection can take place
  • Total internal reflection cannot take place
  • Any of (a) and (b)
  • Data is incomplete
A medium shows relation between iand r as shown. If speed of light in the medium is nc then value of n is
Physics-Ray Optics-87267.png
  • 1.5
  • 2
  • 2–1
  • 3–1/2
A ray of light travels from a medium of refractive index µ to air. Its angle of incidence in the medium is i, measured from the normal to the boundary and its angle of deviation is δ. Δ is plotted against iwhich of the following best represents the resulting curve

  • Physics-Ray Optics-87274.png
  • 2)
    Physics-Ray Optics-87275.png

  • Physics-Ray Optics-87276.png

  • Physics-Ray Optics-87277.png
Assertion A red object appears dark in the yellow light
Reason A red colour is scattered less
  • 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 stars twinkle while the planets do not.
Reason The stars are much bigger in size than the planets.
  • 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 Owls can move freely during night.
Reason They have large number of rods on their retina.
  • 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 air bubble shines in water.
Reason Air bubble in water shines due to refraction 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 In a movie, ordinarily 24 frames are projected per second from one end to the other of the complete film.
Reason The image formed on retina of eye is sustained upto 1/10 second after the removal of stimulus.
  • 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 Blue colour of sky appears due to scattering of blue colour.
Reason Blue colour has shortest wave length invisible spectrum.
  • 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.

Physics-Ray Optics-87280.png
  • 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 setting sun appears to be red.
Reason Scattering of light is directly proportional to the wavelength.
  • 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.

Physics-Ray Optics-87282.png
  • 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 Different speed in vacuum.
Reason Wavelength of light depends on refractive index of medium.
  • 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 colour of the green flower seen through red glass appears to be dark.
Reason Red glass transmits only red 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.

Physics-Ray Optics-87285.png
  • 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 a plane glass slab is placed on the letters of different colours all the letters appear to be raised up to the same height.
Reason Different colour shave different 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 The fluorescent tube is considered better than an electric bulb.
Reason Efficiency of fluorescent tube is more than the efficiency of electric bulb.
  • 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 polar caps of earth are cold in comparison to equatorial plane.
Reason The radiation absorbed by polar caps is less than the radiation absorbed by equatorial plane.
  • 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 A concave mirror and convex lens both have the same focal length in air. When they are submerged in water, they will have same focal length.
Reason The refractive index of water is smaller than the refractive index of air.
  • 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.
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