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In Young double slit experiment, how many minimas can be obtained on a screen

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in Optics by (80 points)
In Young double slit experiment, how many minimas can be obtained on a screen, if wavelength of light used is 2000 Å and slit width is 0.0008 mm-

(1)6

(2)7

(3)8

(4)9
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1 Answer

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by (63.1k points)

For constructive interference

nmax = 8000/2000 = 4

Therefore the number of maxima formed is 2n+1

= 2*4+1=9

Hence answer is 9

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