Question

A ray of light is travelling from a denser medium to rarer medium. For these media critical angle is C. The maximum possible deviation of the ray is ___________.

• A. $\pi -2$
• B. $\pi -2C$
• C. $2C$
• D. ${\pi }_{/2}+C$

Answer 1

The correct option is B $\pi -2C$

The maximum possible deviation of the ray is the condition when total internal reflection just takes place as shown in the figure.

$\Rightarrow$ $\angle i=\angle C$

So,maximum deviation is $\pi -2C$

Therefore, B is correct option.