An object is kept at a distance of 60 cm from a concave mirror. F

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 Multiple Choice QuestionsMultiple Choice Questions

31.

Identify the mismatch in the following

  • Myopia  —  Concave lens

  • For rear view  —  Concave mirror

  • Hypermetropia  —  Convex lens

  • Astigmatism  —  Cylindrical lens


32.

The focal lengths of the objective and the eyepiece of the telescope are 225 cm and 5 cm respectively. The magnifying power of the telescope will be

  • 49

  • 45

  • 35

  • 60


33.

The angle of incidence for an equilateral prism of refractive index 3 so that the ray is parallel to the base inside the prism is

  • 30°

  • 20°

  • 60°

  • 45°


34.

According to Rayleigh scattering law, the amount of scattering is

  • directly proportional to wavelength of light

  • directly proportional to square of wavelength of light

  • inversely proportional to fourth power of wavelength of light

  • inversely proportional to wavelength of light


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35.

An object is kept at a distance of 60 cm from a concave mirror. For getting a magnification of 12, focal length of the concave mirror required is

  • 20 cm

  • 40 cm

  • − 20 cm

  • 30 cm


C.

− 20 cm

 m = - vu 12 = - v60   v = - 30 cm 1f = 1v - 1u 1f = 1- 30 + 1- 60  1f = - 2 - 160 = -360     f = - 20 cm


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36.

If the speed of light in material A is 1.25 times its speed in material B, then the ratio of the refractive indices of these materials is

  • 1.50

  • 1.00

  • 0.800

  • 1.25


37.

The resolving power of a microscope is

  • inversely proportional to numerical aperture

  • directly proportional to wavelength

  • directly proportional to square of the wavelength

  • directly proportional to numerical aperture.


38.

The focal length of the lens of refractive index (µ = 1.5) in air is 10 cm. If air is replaced by water of μ = 43, its focal length is

  • 20 cm

  • 30 cm

  • 40 cm

  • 25 cm


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39.

A beam of natural light falls on a system of 5 polaroids, which are arranged in succession such that the pass axis of each polaroid is turned through 60° with respect to the preceding one. The fraction of the incident light intensity that passes through the system is 

  • 164

  • 132

  • 1512

  • 1128


40.

A glass prism of refractive index 1.5 is immersed in water μ = 43. Refer figure.

          

A light beam incident normally on the face AB is totally reflected to reach the face BC, if

  • 2/3 < sin θ < 8/9

  • sin θ ≤ 2/3

  • cos θ ≥ 8/9

  • sin θ > 8/9


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