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Estimate the distance for which ray optics is good approximation for an aperture of 4 mm and wavelength 400 nm. |
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Answer» SOLUTION :here aperture `a=4mm=4xx10^(-3)m` and wavelength of LIGHT `lamda=400nm=4xx10^(-7)m` `therefore` Distance up to which RAY optics is good `Dle(a^(2))/(lamda)` `impliesD_(max)=(a^(2))/(lamda)=((4xx10^(-3))^(2))/(4xx10^(-7))=40m`. |
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