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Q.

In Young’s double slit experiment both the slits are similar. If width of one of the slits is doubled then

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a

Dark fringes become slightly brighter

b

Bright fringes become less bright

c

Bright fringes become narrower

d

Dark fringes become narrower

answer is C.

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Detailed Solution

On doubling the width of one of the slit intensity of one of the source increases as a result the minimum intensity is non zero hence dark fringe will be brighter . 

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