MHT CET 2024 Physics question

In a Young's double slit experiment, the source is white light. One of the holes is covered by a red filter. In this case

(A)There shall be alternative interference fringes of red and blue
(B)There shall be an interference fringes for red distinct from that for blue.
(C)There shall be no interference fringesCorrect
(D)There shall be an interference fringes for red mixing with one for blue

Answer: (C)

Solution

Sustained interference needs two coherent sources of the same frequency. A coloured filter lets only its own colour (frequency) pass through its slit. When the two slits transmit light of different colours (red from one, blue/other colour from the other, as in the standard form of this question), the two waves have

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Question ID VK-092735