Assertion :In Young's interference experiment fringes become brighter if one of the slits is covered by cellophone paper. Reason: The intensity of light emerging from the slit increases and the two interfering beams have unequal intensities.

Statement I is True and Statement 2 is True and is correct explanation of Statement 1.

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Statement I is True and Statement 2 is True but not the correct explanation of Statement 1.

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Statement I is False and Statement 2 is False

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Statement I is True and Statement 2 is False

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Solution

The correct option is C Statement I is False and Statement 2 is False
If one of the slits in Young's double slit experiment is covered with cellophane paper which absorbs a fraction of the intensity of light from the slit then the intensity (and hence the amplitude) of the light from the covered slit will decrease resulting in a difference in the intensities of the two virtual sources. Hence bright fringes will become less bright and dark fringes will not be completely dark.

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Statement - II: Isoelectronic species should have same charges.

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a

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