Q.

In a double-slit experiment, instead of taking slits of equal width, one slit is made twice as wide as the other. Then, in the interference pattern

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a

the intensities of both the maxima and the minima increases

b

the intensity of the maximum increase and minima has zero intensity

c

the intensity of the maxima decreases and that of minima increases

d

the intensity of the maxima decreases and the minima has zero intensity

answer is A.

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Detailed Solution

when slit are of equal width Imax=I0+I0+2I0I0=4I0Imin=I0+I0−2I0I0=0        When slit are of unequal width, intensity from one slit would increase to twice thenInewmax=2I0+I0+22I0I0=5.83I0Inewmin=2I0+I0−22I0I0=0.17I0Therefore intensities for both the maxima and  minima increase.
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In a double-slit experiment, instead of taking slits of equal width, one slit is made twice as wide as the other. Then, in the interference pattern