find the radius of the first zone in a one plate of focal length 20 cm for a light of wavelength 5000 A.
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r = square root of (fx nx wavelength)
r = square root of (0.2*5*10^-7*1)
r = √(1*10^-8)
r = 1*10^-4 m
radius is 0.0001 m
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