A zone plate of focal length \[60\,cm,\] behaves as a convex lens, If wavelength of incident light is \[6000\,\,{AA},\] then radius of first half period zone will be [RPMT 2001]

A zone plate of focal length \[60\,cm,\] behaves as a convex lens, If

1.	A zone plate of focal length \[60\,cm,\] behaves as a convex lens, If wavelength of incident light is \[6000\,\,{AA},\] then radius of first half period zone will be [RPMT 2001]
A.	\[36\times {{10}^{-8}}m.\]
B.	\[6\times {{10}^{-8}}m.\]
C.	\[3167\,\,{AA}\]
D.	\[6\times {{10}^{-4}}m.\]
Answer» E.

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A zone plate of focal length \[60\,cm,\] behaves as a convex lens, If wavelength of incident light is \[6000\,\,{AA},\] then radius of first half period zone will be [RPMT 2001]

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