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Question

A ray of light travelling in a transparent medium of refractive index μ, falls on a surface separating the medium from air at an angle of incidence of 45o . For which of the following value of μ the ray can undergo total internal reflection ?
  1. μ=1.33
  2. μ=1.50
  3. μ=1.25
  4. μ=1.40

A
μ=1.25
B
μ=1.40
C
μ=1.33
D
μ=1.50
Solution
Verified by Toppr

For total internal reflection,
sin i > sin c
where, i = angle of incidence, C = critical angle

But, sinC=1μsini=1μorμ=1sini

μ>1sin45orμ>2(i=45Given)

Hence, option (c) is correct.

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