In biprism experiment, the light of wavelength λ is used to obtain an interference pattern. Then fringe width is W1 at distance D1 from the screen. When the screen is moved towards biprism, fringe width becomes W2 at distance D2. The distance between two virtual images of the slit is - VgyanHub

Question:

In biprism experiment, the light of wavelength λ is used to obtain an interference pattern. Then fringe width is W₁ at distance D₁ from the screen. When the screen is moved towards biprism, fringe width becomes W₂ at distance D₂. The distance between two virtual images of the slit is

Options :

(a) λ(D2-D1)/(W1-W2)
(b) λ(D1-D2)/(W1-W2)
(c) λ(W2-W1)/(D1-D2)
(d) λ(W1-W2)/(D1-D2)

Answer :

(b) λ(D₁-D₂)/(W₁-W₂)

Answer Steps :

step 1

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