Optics Question 205

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

[RPMT 2002]

Options:

A) Increase

B) Decrease

C) Remain constant

D) None of these

Show Answer

Answer:

Correct Answer: B

Solution:

A=nπdλ

nd=Aπλ = constant

n1d

(n= number of blocked HPZ) on decreasing d,

n increases, hence intensity decreases.



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