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Q.

A cylindrical wavefront is divided into a number of Fresnel’s half period elements. With the increase of the order of the element, the area of the element

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a

may increase or decrease depending upon the wavelength

b

Remains same

c

Decreases

d

Increases

answer is B.

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Detailed Solution

rn=ndλ

Area=πrn2−rn−12=πdλ

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A cylindrical wavefront is divided into a number of Fresnel’s half period elements. With the increase of the order of the element, the area of the element