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Q.

For what distance is ray optics a good approximation when the aperture is 3 mm wide and the wavelength is 500 nm?

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a

18 m

b

9 m

c

6 m

d

12 m

answer is B.

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Detailed Solution

For distance ,  Z≤ZF  Ray optics is the good appropriate

Fresnel distance ZF=a2λ=3×10−325×10−7=18m

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