question_answer

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

A) \[2C\]                                   

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

C)  \[\pi -C\]                            

D)  \[\pi -2C\] 

Correct Answer: B

Solution :

\[OA\text{ }=\]incident ray \[\Delta S=\]interface which separates the two medium. \[OB=\]actual path of the incident ray. \[\angle C=\]critical angle. \[\angle QOB\]is also \[=\angle C\] After incidence ray refract towards OS. \[\therefore \]Deviation \[(\delta )=\angle BOS\] \[=\frac{\pi }{2}-C\]