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Ray Optics and Optical Instruments · Question 73

AIPMT 2001MCQEasy📈 Topic in 12% papers+4−1
1

A ray of light travelling in air has wavelength , frequency n, velocity v and intensity I. If this ray enters into water then these parameters are ', n', v' and I' respectively. Which relation is correct from following?

  1. = '
  2. n = n'
  3. v = v'
  4. I = I'

Answer

(2) n = n'

Solution

Frequency is decided by the source, so it does not change on refraction: n' = n.

In water, speed decreases (v' = v ), so wavelength decreases ( ' = ); part of the light is reflected at the surface, so intensity also decreases.

n = n'

Answer: (2)

AIPMT 2001

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2

A disc is placed on a surface of pond which has refractive index 5/3. A source of light is placed 4 m below the surface of liquid. The minimum radius of disc needed so that light is not coming out is

  2. 3 m
  3. 6 m
  4. 4 m
AIPMT 2001
3

A bubble in glass slab ( = 1.5) when viewed from one side appears at 5 cm and 2 cm from other side, then thickness of slab is

  1. 3.75 cm
  2. 3 cm
  3. 10.5 cm
  4. 2.5 cm.
AIPMT 2000
4

A tall man of height 6 feet, wants to see his full image. Then required minimum length of the mirror will be

  1. 12 feet
  2. 3 feet
  3. 6 feet
  4. any length
AIPMT 2000
5

A plano-convex lens ( = 1.5) has radius of curvature 10 cm. It is silvered on its plane surface. Find focal length after silvering

  1. 10 cm
  2. 20 cm
  3. 15 cm
  4. 25 cm
AIPMT 2000
6

Rainbow is formed due to

  1. scattering and refraction
  2. internal reflection and dispersion
  3. reflection only
  4. diffraction and dispersion.
AIPMT 2000

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