Adouble slit S_(1)S_(2) is illuminatedby a coherentlight of wavelength lambda. The slits are sepa- rated by a distance d . A plane mirror is pplacedin frontof the doubleslitat a distance D_(1) from it and a screen Sigmais placed behind the doubl slitat a distance D_(2)from it . The screen Sigmareceives only the light reflected by the mirror .Find the fringes -width of the interference pattern on the screen .

Adouble slit S_(1)S_(2) is illuminatedby a coherentlight of wavelength

1.	Adouble slit S_(1)S_(2) is illuminatedby a coherentlight of wavelength lambda. The slits are sepa- rated by a distance d . A plane mirror is pplacedin frontof the doubleslitat a distance D_(1) from it and a screen Sigmais placed behind the doubl slitat a distance D_(2)from it . The screen Sigmareceives only the light reflected by the mirror .Find the fringes -width of the interference pattern on the screen .
Answer» `LAMBDA/d (D_(1)+D_(2))` `(2lambda)/d (D_(1)+2D_(2))` `lambda/d (2D_(1)+D_(2))` `lambda/(2d) (D_(1)+D_(2))` ANSWER :C

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