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Ray Optics and Optical Instruments · Question 72

AIPMT 2001MCQEasy📈 Topic in 25% papers+4−1
1

Optical fibres are based on

  1. total internal reflection
  2. less scattering
  3. refraction
  4. less absorption coefficient

Answer

(1) total internal reflection

Solution

As per NCERT, an optical fibre has a core of higher refractive index than the cladding; light entering it strikes the core–cladding boundary at angles greater than the critical angle and is carried along by repeated total internal reflection.

Answer: (1)

AIPMT 2001

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2

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'
AIPMT 2001
3

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
4

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
5

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
6

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
7

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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