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Ray Optics and Optical Instruments · Question 77

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

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)

AIPMT 2000

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2

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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