question_answer

A concave mirror of focal length f (in air) is immersed in water (\[\mu =4/3\]). The focal length of the mirror in water will be                                                                                                [MNR 1998]

A)            \[f\]                                         

B)            \[\frac{4}{3}\]\[f\]

C)            \[\frac{3}{4}f\]                    

D)            \[\frac{7}{3}\]\[f\]