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Ray Optics and Optical Instruments · Question 75

AIPMT 2000MCQEasy📈 Topic in 12% papers+4−1
1

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.

Answer

(3) 10.5 cm

Solution

Apparent depth = real depth real depth = apparent depth

Real distance of the bubble from the first face = 1.5 5 = 7.5 cm

Real distance of the bubble from the other face = 1.5 2 = 3 cm

Thickness = 7.5 + 3 = 10.5 cm

Answer: (3)

AIPMT 2000

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2

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
3

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
4

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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