question_answer

A ray of light travels from an optically denser medium towards rarer medium. The critical angle for the two media is C. The maximum possible angle of deviation of the ray is

A)                  \[\frac{\pi }{2}-C\]                                         

B)                  \[\pi -2C\]

C)                  \[2C\]                                  

D)                  \[\frac{\pi }{2}+C\]

Correct Answer: B

Solution :

                 When the ray passes into the rarer medium, the deviation is \[\delta =\text{o}|0.\]This can have a maximum valve of \[\left( \frac{\pi }{2}-C \right)\]for \[\theta =C\]and \[\text{o }\!\!|\!\!\text{ =}\frac{\pi }{2}\]                                 When the total internal reflection occurs. The deviation is \[\delta =\pi -2,\] the minimum value of\[\text{ }\!\!\theta\!\!\text{ }\] being C. The maximum valve of \[\delta =\pi -2C\]