The radius of the first zone in a zone plate of focal length 25cm for – McqOptions

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1.	The radius of the first zone in a zone plate of focal length 25cm for a light of wavelength 5000 Å is ____
A.	0.01 cm
B.	0.02 cm
C.	0.03 cm
D.	0.04 cm
Answer» D. 0.04 cm

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