A beam of light is travelling from region II to region III (see the figure). The refractive index in region I, II and III are
and
respectively. The angle of incidence 
for which the beam just misses entering region III is
.png)
a)
b)
c)
d)
andrespectively. The angle of incidence for which the beam just misses entering region III isa)
b)
c)
d)
Question ID - 152734 | SaraNextGen Top 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)
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
127 votes
Answer Key / Explanation : (a) -
(a)
The critical angle for region II and III
.png)
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.
127 votes
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127