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Q.

When a monochromatic light is passed around a file wire a diffraction pattern is observed. How the fringe width will change by increasing the diameter?

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a

Fringe width changes with change of wavelength only

b

Fringe width has no relation with the diameter of wire

c

Decreases

d

Increases

answer is C.

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Detailed Solution

β=λD/d, where d is the diameter of the wire. So, if the diameter increases, fringe with decreases.

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