A : In Young.s double slit experiment the two slits are at distance d apart. Interference pattern is observed on a screen at distance D from the opposite to one of the slits, a dark fringe is observed, then the wavelength of wave is proportional to square of distance of two slits. R : For a dark fringe intensity is zero in double slit experiment.

A : In Young.s double slit experiment the two slits are at distance d

1.	A : In Young.s double slit experiment the two slits are at distance d apart. Interference pattern is observed on a screen at distance D from the opposite to one of the slits, a dark fringe is observed, then the wavelength of wave is proportional to square of distance of two slits. R : For a dark fringe intensity is zero in double slit experiment.
Answer» Both A and R are TRUE and R is the correct explanation of A Both A and R are true and R is not the correct explanation of A A is true and R is false Both A and R are false Answer :B

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