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A double slit S(1)S(2) is illuminated by...

A double slit `S_(1)S_(2)` is illuminated by a coherent light of wavelength `lambda`. 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 `Sigma` is placed behind the double slit at a distance `D_(2)` from it. The screen `Sigma` 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

Verified by Experts

The correct Answer is:
C
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