Q 12-10-166JEE MainJEE Main 2025 (8 Apr, Shift 2)Easy
In a Young's double slit experiment, the source is white light. One of the slits is covered by a red filter and the other by a green filter. In this case:
Answer: (B) There shall be no interference fringes.
Interference needs coherent waves of the same frequency. Light through one slit is red and through the other is green: different frequencies, so their phase difference keeps changing and no steady fringe pattern forms. The screen shows a uniform mixture of the two colours.
Solution by Sreeraj P, M.Sc Physics