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

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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
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Correct Answer - 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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