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A double slit S1-S2 is illuminated by a ...

A double slit `S_1-S_2` is illuminated by a coherent light of wavelength `lamda`. The slits are separated by a distance d. A plane mirror is placed in front of the double slit at a distance `D_1`, from it and a screen `sum` is placed behind the double slit at a distance `D_2`, from it . The screen `sum` receives only the light reflected by the mirror. Find the fringe-width of the interference pattern on the screen.

A

`lambda/d (D_(1)+D_(2))`

B

`(2lambda)/d (D_(1)+2D_(2))`

C

`lambda/d (2D_(1)+D_(2))`

D

`lambda/(2d) (D_(1)+D_(2))`

Text Solution

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The correct Answer is:
C
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