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How large can be the aperture opening to...

How large can be the aperture opening to work with laws of ray optics using a monochromatic light of wavelength 450 nm to a distance of around 20 m?

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Now, here we are given festival distance equal to 20m, `lamda=450nm` we have to estimate value of a.
Putting `Z_F=a^2/lamda,a=sqrtZ_Flamda=3 times 10^-3m or 3mm`
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