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In Fresnel diffraction, if the distance ...

In Fresnel diffraction, if the distance between the disc and the screen is decreased, the intensity of central bright spot will

A

(a) Increase

B

(b) Decrease

C

(c) Remain constant

D

(d) None of these

Text Solution

Verified by Experts

The correct Answer is:
B
`A=npidlambdaimpliesnd=(A)/(pilambda)=const ant`
`impliesnprop1/d`(n=number of blocked HPZ) on decreasing d, n increases, hence intensity decreases.
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