The focal length for violet, green and red light rays are `f_V,f_G` and `f_R` respectively. Which of the following is the true relationship?

Options

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

Answer

B

Explanation

`f prop (1)/(n - 1) and lambda prop (1)/(n)`.