JEE Questions for Physics Ray Optics Quiz 8 - MCQExams.com

A concave lens is in contact with convex lens. The ratio of the magnitude of their power is 2/3. Their equivalent focal length is 30 cm. What are their individual focal lengths in cm?
  • –75, 50
  • – 10, 15
  • 75, 50
  • – 15, 10
A telescope has an objective lens of focal length 200 cm and an eye piece with focal length 2 cm. If this telescope is used to see a 50 m tall building at a distance of 2 km, what is the height of the image of the building formed by the objective lens
  • 5 cm
  • 10 cm
  • 1 cm
  • 2 cm
The apparent depth of water in cylindrical water tank of diameter 2 R 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 cc per minute is (n1 = refractive index of air, n2 = refractive index of water)

  • Physics-Ray Optics-85674.png
  • 2)
    Physics-Ray Optics-85675.png

  • Physics-Ray Optics-85676.png

  • Physics-Ray Optics-85677.png
A candle of diameter d is floating on a liquid in a cylindrical container of diameter D (>> d) as shown in Fig. If it is burning at the rate of 2 cm/hour, then the tip of the candle will
Physics-Ray Optics-85679.png
  • remain at the same height
  • fall at the rate of 1 cm/hour
  • fall at the rate of 2 cm/hour
  • go up at the rate of 1 cm/hour
The magnification of the image when an object is placed at a distance x

  • Physics-Ray Optics-85680.png
  • 2)
    Physics-Ray Optics-85681.png

  • Physics-Ray Optics-85682.png

  • Physics-Ray Optics-85683.png
The velocity of light is maximum in a medium of
  • diamond
  • water
  • glass
  • vacuum
A light of wavelength 320 nm enters in a medium of refractive index 1.6 from the air of refractive index 1.0 The new wavelength of light in the medium will be ― nm.
  • 520
  • 400
  • 320
  • 220
\ Bhautik\ runs towards a plane mirror with a speed of 20 ms–1, what is the speed of his image ?
  • 45 ms–1
  • 20 ms–1
  • 15 ms–1
  • 7.5 ms–1
A ray of light is incident at an angle 30o on a mirror, The angle between normal and reflected ray is___________.
  • 15o
  • 30o
  • 45o
  • 60o
The no. of images formed between two parallel plane mirror are ______________.
  • ∞
  • 0
  • 180
  • 360
To get five images of a single object one should have two plane mirrors at an angle of___________.
  • 36o
  • 72o
  • 180o
  • 302o
If a glass rod is immersed in a liquid of the same refractive index, then it will______________.
  • appear bent
  • appear longer
  • disappear
  • appear shorter
For four different transparent medium n41 × n32 × n21 = ____________ .

  • Physics-Ray Optics-85687.png
  • n41
  • n14

  • Physics-Ray Optics-85688.png
A Plane mirror produces a magnification of_____________.
  • 0
  • +1
  • – 1
  • ∞
A ray light passes through four transparent media with refractive indices n1, n23, n4 as shown in figure The surfaces of all media are parallel, if the emergent ray DE is parallel of the incident ray AB we must have_______________
Physics-Ray Optics-85689.png
  • n1 = n2
  • n3 = n4
  • n1 = n4
  • n2 = n3
A convex lens forms a real image of an object for it s two different positions on a screen if height of the image in both cases be 16 cm and 4 cm then height of the object is__________cm.
  • – 4
  • 4
  • – 8
  • 8
In shown figure two parallel rays incident on a mirror they are reflected as parallel rays as shown in the same figure what is the nature of the mirror ?
Physics-Ray Optics-85691.png
  • plane mirror
  • concave
  • convex
  • plane–concave
The power of plane glass is__________.
  • ∞
  • 0
  • 2D
  • 4D
A convex lens is made up of three different materials as shown in figure, for point object placed on its axis, the no. of images formed are__________.
Physics-Ray Optics-85692.png
  • 4
  • 2
  • 3
  • 1
Two thin lenses of focal lengths f1 and f2 are co-axially placed incontact with each other then, the power of combination is__________.

  • Physics-Ray Optics-85693.png
  • 2)
    Physics-Ray Optics-85694.png

  • Physics-Ray Optics-85695.png

  • Physics-Ray Optics-85696.png
If thin prism of 5o gives a deviation of 2o then the refractive index of material of prism is_________.
  • 1.4
  • 1.5
  • 1.6
  • 1.0
It is difficult to see through the fog because _________________
  • light is scattered by the droplets in the fog
  • fog absorbs light
  • refractive index of fog is infinity
  • light suffers tote internal reflection
what is the time taken in seconds to cross a glass plate of thickness 6 mm and μ = 2.0 by light ?
  • 8 × 10–11
  • 4 × 10–11
  • 2 × 1011
  • 16 × 10–11
Which of the following diagrams shows correctly the dispersion of white light by a prism ?

  • Physics-Ray Optics-85697.png
  • 2)
    Physics-Ray Optics-85698.png

  • Physics-Ray Optics-85699.png

  • Physics-Ray Optics-85700.png
Assertion : Focal length of a lens for red colour is smaller than its focal length for violet colour
Reason : is because nr > nv
  • both assertion and reason are true and the reason is correct explanation of the assertion
  • both assertion and reason are true but reason do not explain the assertion
  • Assertion is true but the reason are false
  • both assertion and reason are false
In which of the following cases a man will not see image grater than himself
  • convex mirror
  • concave mirror
  • plane mirror
  • none of these
glass slab (n =1.of thickness 9 cm is placed over a written paper what is the Shift in the lattes ?
  • 6 cm
  • 3 cm
  • 2 cm
  • 0 cm
A concave mirror of focal length 20 cm forms an virtual image having twice the linear dimensions of the object, the position of the object will be ___________cm
  • 7.5
  • – 10
  • 10
  • – 7.5
In experiment to find focal length of a concave mirror a graph is drawn between the magnitude of u and v. The graph looks like___________.

  • Physics-Ray Optics-85702.png
  • 2)
    Physics-Ray Optics-85703.png

  • Physics-Ray Optics-85704.png

  • Physics-Ray Optics-85705.png
A mark at the bottom of the liquid appears to rise by 0.2 m, If depth of the liquid is 2.0 m then refractive index of the liquid is________________.
  • 1.80
  • 1.60
  • 1.33
  • 1.11
1.6 is a refractive index of plano-convex lens, then the redius of curvature of the curved sunface is 60 cm. The focal length of the lens is_______ cm
  • 50
  • 100
  • – 50
  • – 100
One convex lens and one concave lens placed is contect with each other. If the ratio of their power is 2/3 and focal length of the combination is 30 cm, then individual focal lengths are__________.
  • 15 cm and –10 cm
  • –15 cm and 10 cm
  • 30 cm and –20 cm
  • –30 cm and –30 cm
A thin prism of 3o, angle made from glass of refractive index 1.5 is combined with another thin prism made from glass of refractive index 1.3 to produce dispersion without deviation. what is the angle of Prism of second prism.
  • 3o
  • –3o
  • -5o
  • 5o
If a ray of light is incident on a plane mirror at an angle of 30o then deviation produced by a plane mirror is____________.
  • 60o
  • 90o
  • 120o
  • 150o
The frequency of a light wave in a material is 4 × 1014 Hz and wave length is 5000 Å. The refractive index of material will be____________ (take c = 3 × 108 ms–1)
  • 1.5
  • 1.7
  • 1.33
  • None of these
Mono chromatic light of wavelength 399 nm is incident from air on a water (n = 1.Surface. The wavelength of refracted light is ________________nm
  • 300
  • 600
  • 333
  • 443
If the refractive index of a material of an equilateral Prism is √3, then angle of minimum deviation will be ____________.
  • 50o
  • 60o
  • 39o
  • 49o
If the critical angle for total internal reflection from a medium to vacuum is 30o then velocity of light in the medium is _____________ms–1 (take c = 3.0 × 108 ms–1)
  • 2.0 × 108
  • 1.5 × 108
  • 108
  • 1.5 × 10–8
A ray of light passes from glass (n = 1.to medium (n = 1.The value of the critical angle of glass is___________.

  • Physics-Ray Optics-85711.png
  • 2)
    Physics-Ray Optics-85712.png

  • Physics-Ray Optics-85713.png

  • Physics-Ray Optics-85714.png
A double convex lens of focal length 6 cm is made of glass of refractive index 1.5, The radius of curvature of one surface is double than that of the other surface. The value of small radius of curvature is_________.
  • 6
  • 9
  • 12
  • 4.5
When a ray of light enters in a transparent medium of refractive index n, then it is observed that the angle of refraction is half of the angle of incidence. The value of angle of incidence will be _________.

  • Physics-Ray Optics-85716.png
  • 2)
    Physics-Ray Optics-85717.png

  • Physics-Ray Optics-85718.png

  • Physics-Ray Optics-85719.png
A prism of glass is shown in figure A, ray incident normally on one face is totally reflected. If θ is 45o , the index of refraction of glass is_____________.
Physics-Ray Optics-85721.png

  • Physics-Ray Optics-85722.png
  • 2)
    Physics-Ray Optics-85723.png
  • = 2
  • None of these
A convex lens made up of a material of refractive index n1 is immersed in a medium of refractive index n2 as shown in the figure. The relation between n1 and n2 is___________.
Physics-Ray Optics-85725.png

  • Physics-Ray Optics-85726.png
  • n1 = n2
  • n1 < n2
  • n1 > n2
Two Plano – convex lenses of radius of curvature R and refractive index n = 1.5 will have equivalent focal length equal to R, when they are placed__________.
  • at distance R
  • at distance R/4
  • at distance R/2
  • in contact with each other
A double convex lens made of glass of refractive index 1.6 has radius of curvature 15 cm each. The focal length of this lens when immersed in a fluid of refractive index 1.63 is____________.
  • – 40.75
  • – 407.5
  • – 125
  • – 12.5
One ray of light suffers minimum deviation in an equilateral prism P additional prism Q and R of identical shown in figure. The ray will now suffer____________.
Physics-Ray Optics-85728.png
  • greater deviation
  • total internal reflection
  • same divination as before
  • no deviation
Which of the following colours is scattered minimum ?
  • Violet
  • red
  • blue
  • yellow
Angle of minimum devaition for a prism refractive index 1.5 is equal to the angle of the prism Then the angle of prism___________(given sin 48o 36\' = 0.75)
  • 62o
  • 82o
  • 60o
  • 41o
In a thin prism of glass (ang = 1.which of the following relation between the angle of minimum deviation δm and the angle of refraction r will be correct ?

  • Physics-Ray Optics-85730.png
  • 2)
    Physics-Ray Optics-85731.png

  • Physics-Ray Optics-85732.png

  • Physics-Ray Optics-85733.png
An observer look at a tree of height 10 meters away with a telescope of magnifying power 10. To him, the tree appears______________.
  • 10 times taller
  • 10 times smaler
  • 10 times nearer
  • 20 times nearer
0:0:1


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