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Q.

If the source of light used in a Young’s double slit experiment is changed from red to violet.

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a

The fringes will become brighter

b

The intensity of minima will increase

c

Consecutive fringe lines will come closer

d

The central bright fringe will become a dark fringe.

answer is C.

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Detailed Solution

Wavelength of Violet light is smaller than Red light. Also, fringe width is directly proportional to wavelength.Thus, Fringe width decreases as wavelength decreases.
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