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A beam of light is travelling from region II to region III (see the figure). The refractive index in region I, II and III areandrespectively. The angle of incidence  for which the beam just misses entering region III is

a)

b)

c)

d)


Question ID - 152734 | Toppr Answer

A beam of light is travelling from region II to region III (see the figure). The refractive index in region I, II and III areandrespectively. The angle of incidence  for which the beam just misses entering region III is

a)

b)

c)

d)

1 Answer - 5876 Votes

3537

Answer Key : (a) -

(a)

The critical angle for region II and III

The ray, if incident at  at the interface of II and III it will be totally internally reflected.

Now, from Snell’s lay in region I and II.



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