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Question

In a Young’s double slit experiment, wavelength of light used is ?. Let O be the centre of line joining the slits and C be the centre of screen where interference pattern is being obtained. ? is the angular position of each slit with respect to C and ? is the angular position of first maxima with respect to O. select the correct option(s).

A
Fringe width obtained is λθ2
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B
Fringe width obtained is λ2θ
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C
The distance between the slits is λϕ
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D
The distance between the slits and screen is λ2ϕθ
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Solution

The correct options are
B Fringe width obtained is λ2θ
C The distance between the slits is λϕ
D The distance between the slits and screen is λ2ϕθ

ω=Dλd=Dϕ and d2=Dθ
ω=λ2θ,d=λϕ and D=d2θ=λ2ϕθ

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