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 double slit S_(1)S_(2) is illuminated by a coherent light of wavelen

1.	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.
Answer» `(LAMBDA)/(d)(D_(1) + D_(2))` `(2 lambda)/(d)(D_(1) + 2D_(2))` `(lambda)/(d)(2D_(1) + D_(2))` `(lambda)/(2d)(D_(1) + D_(2))` Answer :C

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