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For what distance is ray optics a good a...

For what distance is ray optics a good approximation when the aperture is `3 mm` wide and wavelength is `500 nm` ? (NCERT Solved Example)

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Here, `a = 3 mm = 3 xx 10^(-3)m`,
`lambda = 500 nm = 5 xx 10^(-7) m`
Fresnel distance, `Z_(F) = (3 xx 10^(-3))^(2)/(5 xx 10^(-7)) = 18m`
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