A light ray of wavelength X is passing through a pin hole of diameter D and the effect is observed on a screen placed at a distance L from the pin hole. The approximation of geometrical optics are applicable if

Options

A. `D le lambda`
B. `(L lambda)/D^(2) = 1`
C. `(L lambda)/D^(2) gtgt 1`
D. `(L lambda)/D^(2) ltlt 1`

Answer

c

Explanation

The approximation of geometrical optics is applicable if`(Llambda)/D^(2) ltlt1`