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YDSE Problems I

In Young's do...

Question

In Young's double slit experiment, to increase the fringe width

A

the wavelength of the source is increased

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B

the source is moved towards the slit

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C

the source is moved away from the slit

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D

the slit separation is increased

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E

the screen is moved towards the slit

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Solution

The correct option is A the wavelength of the source is increased
By Young's double slit experiment
Fringe width $β = \frac{D λ}{d}$
According to equation, the fringe width is directly proportional to $λ$ .
Thus fringe width of the pattern can be increased by increasing the wavelength of the source.

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