Question

for an aperture of size a illuminated by a parallel beam of light having wavelength λ the fresnel distance is

ans a^2/λ       what is fresnel dist.??

Joshi sir comment

fringe width β = λD/d

for β = d , D is called fresnel distance

so d2 = λD

so D = d2/ λ

now change d by a

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solved thus delete this

SARIKA 11 year ago is this solution helpfull: 2 0

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