In Young's double-slit experiment, white light is used. One slit is covered with a red filter and the other with a green filter. What is observed?
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Question

In Young's double-slit experiment, white light is used. One slit is covered with a red filter and the other with a green filter. What is observed?

G1 Physics · Accepted Answer

Interference fringes require two coherent waves of the same frequency to overlap. Here, one slit transmits red light while the other transmits green light. The two transmitted waves have different frequencies, so they do not form a stationary two-beam interference pattern with each other. Therefore no stable interference fringes are formed. Correct option: B.