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

For what distance is ray optics a good approximation when the aperture

1.	For what distance is ray optics a good approximation when the aperture is 3mm wide and the wavelength is 500 nm?
Answer» Solution :`Z_(F)=(a^(2))/(lamda)=((3xx10^(-3))^(2))/(5XX10^(-7))=18m`

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

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