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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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Answer» Solution :`Z_(F)=(a^(2))/(lambda)=((3XX10^(-3))^(2))/(5xx10^(-7))=18m` This example shows that even with a small APERTURE, diffraction spreading can be neglected for rays MANY metres in length. Thus, ray optics is valid in many COMMON situations. |
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