Interference is produced with two coherent sources of same intensity. If one of the sources is covered with a thin film so as to reduce the intensity of light coming out of it, then

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bright fringes will be more bright and dark fringes will be more dark

cannot be decided

bright fringes will be less bright and dark fringes will be less dark

the brightness of the bright fringes and the darkness of the dark fringes remain same

answer is A.

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Detailed Solution

If a thin film is introduced in front one of the slit such that the intensity of the source reduces then the maximum intensity will decrease and the minimum intensity which was zero now increases .

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Best Online Course for CBSE