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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 `2 mm` wide and wavelength is `600 nm` ?

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Ray optics is a good approximately upto Fresnel distance only.
`Z_(F)=a^(2)/lambda=((2xx10^(-3))^(2))/((600xx10^(-9)))=6.7m`
Hence, the ray optics hold good upto distance of 6.7 m.
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