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Huygens' Principle

If width of s...

Question

If width of slits is doubled the intensity of central Maxima in diffraction becomes 4 times. However in case of YDSE, intensity is proportional to width of slit . So in the former case, intensity should become twice. How is it possible?

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Solution

Dear Student, You are comparing a case of diffraction with interference. In YDSE, intensity is not related to the width but with the number of slits in which width increases with the increase in the number of point slits. As the width of each slit increases, diffraction dominates in which amplitude doubles when the number of slit doubles and hence intensity always becomes 4 times. Regards

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