Light of wavelength `5 xx 10^(-7)m` is diffracted by an aperture of width `2 xx 10^(-3)m`. For what distance travelled by the diffrated beam does the spreading due to diffraction become greater than width of the aperture ?
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Here, `lambda = 5 x 10^(-7)m`, `a = 2 xx 10^(-3)m` Fresnel Distance, `Z_(F) = (a^(@))/(lambda) = (2 xx 10^(-3))^(2)/(5 xx 10^(-7))` `= 8m`
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