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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 central bright fringe will become a dark fringe.

b

The fringes will become brighter

c

The intensity of minima will increase

d

Consecutive fringe lines will come closer

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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