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Single Slit Diffraction

The slits in ...

Question

The slits in a Young's double slit experiment have equal width and the source is placed symmetrically with respect to the slits. The intensity at the central fringe is I₀. If one of the slits is closed, the intensity at this point will be
(a) I₀
(b) I₀/4
(c) I₀/2
(d) 4I₀

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Solution

(b) I₀/4

Total intensity coming from the source is I₀which is present at the central maxima. In case of two slits, the intensity is getting distributed between the two slits and for a single slit, the amplitude of light coming from the slit is reduced to half which leads to 1/4th of intensity.

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