If prism angle α = 1 ∘ , μ = 1.54 , distance between screen and prism ( D ) = 0.7 m , distance between prism and source a = 0.3 m , λ = 180 π nm , then in Fresnal biprism find the value of β (fringe w

Question

If prism angle α = 1 ∘ , μ = 1.54 , distance between screen and prism ( D ) = 0.7 m , distance between prism and source a = 0.3 m , λ = 180 π nm , then in Fresnal biprism find the value of β (fringe width).

TestHub · Accepted Answer

a = 0.3 α = 1 ∘ , μ = 1.54 , we know that d = 2 a ( μ − 1 ) α ​ = 2 × 0.3 ( 1.54 − 1 ) × 1 = 2 × 0.3 × 0.54 = 0.324 ​ Fringe width F = d D λ ​ = 0.324 0.7 × 180 π × 1 0 − 9 ​ = 324 7 × 180 π × 1 0 − 6 ​ = 1 0 − 3 mm

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