The contrast in the fringes in any interference pattern depends on:

Options

A. Fringe width
B. wavelength
C. Intensity ratio of the sources
D. Distance between the sources

Answer

C

Explanation

Contrast indicates the ratio of maximum position intensity on screen to the minimum possible intensity.
As `(I_("max"))/(I_("min")) = ((sqrt(I_(1)) + sqrt(I_(2)))^(2))/((sqrt(I_(1)) - sqrt(I_(2)))^(2))`
So it only depends on the source intensity.