If prism angle α = 1o , μ= 1.54, distance between screen and prism (D) = 0. 7 m, distance between prism and source nm, then in Fresnal biprism find the value of β (fringe width).
10-4 m
10-3 mm
10-4 × m
B.
10-3 mm
a = 0.3
μ = 1.54
We know that
d = 2a ( μ - 1 )
= 2 × 0.3 ( 1.54 - 1 ) × 1
= 2 × 0.3 × 0.54
d = 0.324
Fringe width F =
=
=
F = 10-3 mm
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