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.
1.5
1.7
2.0
2.5
A
2.0
B
1.7
C
2.5
D
1.5
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Solution
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u=−infinity ; v=+2R ; R=+R
μ2v−μ1u=μ2−μ1R
μ2R=μ−1R
μ=2
option C is correct
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