Basic Maths and Units and DimensionsHard
Question
A light beam is travelling from Region I to Region IV (Refer Figure). The refractive index in Regions I, II, III and IV are n0, 
and 
, respectively. The angle of incidence θ for which the beam just misses entering Region IV is
Figure:
and , respectively. The angle of incidence θ for which the beam just misses entering Region IV isFigure:
Options
A.sin-1
B.sin-1
C.sin-1
D.sin-1
Solution
Total internal reflection occurs at the interface of region III and IV.
Because mediums are parallel
n0 sin θ =
sin θ = 1/8
Because mediums are parallel
n0 sin θ =
sin θ = 1/8
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