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Problem
Problem
A parallel coherent beam of light falls on fresnel biprism of refractive index
μ
\mu
μ
and angle
α
\alpha
α
. The fringe width on a screen at a distance
D
D
D
from biprism will be (wavelength =
λ
\lambda
λ
) (a)
λ
2
(
μ
−
1
)
α
\frac{\lambda}{2(\mu-1)\alpha}
2
(
μ
−
1
)
α
λ
(b)
λ
D
2
(
μ
−
1
)
α
\frac{\lambda D}{2(\mu-1)\alpha}
2
(
μ
−
1
)
α
λ
D
(c)
D
2
(
μ
−
1
)
α
\frac{D}{2(\mu-1)\alpha}
2
(
μ
−
1
)
α
D
(d) None of these
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