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Question

A parallel beam of light falls on a solid transparent sphere of radius R. If the incident beam is focussed at A, then find the refractive index of the sphere.
161186_8432a379efe144c3a27b603cf1eaca88.png
  1. 1.5
  2. 1.7
  3. 2.0
  4. 2.5

A
2.0
B
1.7
C
2.5
D
1.5
Solution
Verified by Toppr

u=infinity ; v=+2R ; R=+R

μ2vμ1u=μ2μ1R

μ2R=μ1R

μ=2

option C is correct

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