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Assertion             :       In Young?s double slit experimen
Question

Assertion             :       In Young?s double slit experiment, the fringes become indistinct if one of the slits is covered with cellophane paper. Reason                 :   The cellophane paper decrease the wavelength of light.

A
If both assertion and reason are true and the reason is the correct explanation of the assertion.

B
If both assertion and reason are true but reason is not the correct explanation of the assertion.

C
If assertion is true but reason is false.

D
If the assertion and reason both are false.

E
If assertion is false but reason is true.

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Assertion             :       In Young?s double slit experiment, the fringes become indistinct if one of the slits is covered with cellophane paper. Reason                 :   The cellophane paper decrease the wavelength of light.
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            When one of slits is covered with cellophane paper, the intensity of light emerging from the slit is decreased (because this medium is translucent). Now the two interfering beam have different intensities or amplitudes. Hence intensity at minima will not be zero and fringes will become indistinct.
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Question 1
When one of the slits of Young?s experiment is covered with a transparent sheet of thickness 4.8 mm, the central fringe shifts to a position originally occupied by the 30th bright fringe. What should be the thickness  of the sheet if the central fringe has to shift to the position occupied by 20th bright fringe                                  [KCET 2002]

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Question 2
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Question Text
Assertion             :       In Young?s double slit experiment, the fringes become indistinct if one of the slits is covered with cellophane paper. Reason                 :   The cellophane paper decrease the wavelength of light.
Answer TypeText solution:1
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