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Question

The slits in a Young's double slit experiment are illuminated by two different wavelengths λ1 and λ2. A thin film is placed in front of the slit S1, which blocks λ1 and allows λ2 to pass. Another thin film is placed in front of S2 such that it blocks λ2 and allows λ1 to pass. Then, on the screen, we will observe

A
an interference pattern due to both λ1 and λ2
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B
an interference pattern due to λ1 only, which is shifted along S1
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C
an interference pattern due to λ2 only, which is shifted along S2
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D
no interference pattern
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Solution

The correct option is D no interference pattern
As a result of both the films, the two slits are sources of two different wavelengths, λ1 and λ2. This means that S1 and S2 are now non-monochromatic sources. So, no interference pattern will be obtained.

Hence, (D) is the correct answer.

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