The focal length of a converging lens is measured for violet, green and red colours. If is `f_(v)`, `f_(G)` and `f_(R)` respectively. We will get

Options

A. `f_(v) = f_(G)`
B. `f_(G) = f_(R)`
C. `f_(v) lt f_(R)`
D. `f_(v) gt f_(R)`

Explanation

`(1)/(f)=(mu-1)((1)/(R_(1))-(1)/(R_(2)))i.e.fprop(1)/(mu-1)`