question_answer

If red light and violet light rays are of focal lengths \[{{F}_{R}}\] and \[{{F}_{V}}\] respectively, then which one of the following is true?

A) \[{{\lambda }_{R}}\le {{\lambda }_{\,V}}\]       

B)        \[{{\mu }_{R}}>{{\mu }_{\,V}}\]

C) \[{{\mu }_{R}}={{\mu }_{\,V}}\]         

D)        \[{{\mu }_{R}}<{{\mu }_{\,V}}\]

Correct Answer: D

Solution :

[d] Red light less deviates than violet light. So, \[{{F}_{R}}>{{F}_{V}}.\] Thus, \[{{\mu }_{R}}>{{\mu }_{V}}\] Therefore, option [d] is correct.