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
Read 1 Solution.
solved thus delete this
SARIKA 12 year ago
is this solution helpfull: 2 0