Estimate the distance for which ray optics is good approximation for an aperture of `4 mm` and wavelength `400 nm`.

Estimate the distance for which ray optics is good approximation for a

1.	Estimate the distance for which ray optics is good approximation for an aperture of `4 mm` and wavelength `400 nm`.
Answer» Here, `a=4`mm`=4xx10^(-3)`m. `lambda=400` nm `=400xx10^(-9)m=4xx10^(-7)m`. `:.` Fresnel distance, `Z_(F)=a^(2)/lambda=((4xx10^(-3))^(2))/(4xx10^(-7))=(16xx10^(-6))/(4xx10^(-7))=40 M`.

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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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