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A zone plate of focal length , 60cm beha...

A zone plate of focal length , 60cm behaves as a convex lens, If wavelength of incident light is , `6000 Å` then radius of first half period zone will be

A

`36 xx 10^(-8)m`.

B

`6 xx 10^(-8)m`.

C

`sqrt(6) xx 10^(-8)m`.

D

`6 xx 10^(-4)m`.

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The correct Answer is:
D
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