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Ray Optics and Optical Instruments · Question 76

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

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

Answer

(2) 3 feet

Solution

Rays from the top of the head and from the feet reach the eye after reflection from the plane mirror at points midway (in height) between the eye and the head, and between the eye and the feet.

Minimum length of mirror = 12 × height of the man

= 62 = 3 feet

Answer: (2)

AIPMT 2000

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2

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
3

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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