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Ray Optics and Optical Instruments

AIPMT 2000MCQMedium📈 Topic in 38% papers+4−1
Ques. 1AIPMT 2000

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

Answer

(1) 10 cm

Solution

Focal length of the plano-convex lens (lens maker's formula):

1fL = ( - 1) ( 1R - 1 ) = 0.510

fL = 20 cm

Light passes through the lens twice and is reflected once by the silvered plane surface (Pm = 0):

P = 2PL + Pm = 220 + 0

F = 202 = 10 cm

Answer: (1)

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Ques. 2AIPMT 2000

Rainbow is formed due to

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

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