If white light is used in the Newton’s rings experiment, the colour observed in the reflected light is complementary to that observed in the transmitted light through the same point. This is due to

Options

A. `90^(@)` change of phase in one of the reflected waves
B. `180^(@)` change of phase in one of the reflected waves
C. `145^(@)` change of phase in one of the reflected waves
D. `45^(@)` change of phase in one of the reflected waves.

Answer

A

Explanation

In reflected waves, at the surface of air to glass there is a phase difference of `pi//2`. But this is not there for transmitted rays. The dark and bright regions will be reversed.