A) its path must change
B) its amplitude should change
C) its velocity must change
D) its frequency must change
Correct Answer: C
Solution :
The maximum possible angle of incidence is\[{{90}^{o}}\]. If the angle of prism is\[2\,\,C\], the path is as shown in figure.
When angle of prism becomes slightly greater than\[2C\], the angle of incidence at the face \[AC\] becomes greater than C and so the ray suffers\[T.I.R\]. So, \[A=2\,\,C=2{{\sin }^{-1}}\frac{1}{\mu }\] So, options [b] and [d] are correct.
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