Light passes through a single slit If the width of the slit in reduced, what hap

Question

Light passes through a single slit If the width of the slit in reduced, what happens to the width of the central bright fringe? The width of the central bright fringe doe' not change, because it depends only on the wavelength of the light and not on the width of the slit The central bright fringe becomes wider, because the angle that locate the first dark fringe on either side of the central bright fringe becomes smaller. The central bright fringe becomes wider, because the angle that locates the first dark fringe on either side of the central bright fringe becomes larger The central bright fringe becomes narrower, because the angle that locates the first dark fringe on either side of the central bright fringe becomes larger. The central bright fringe becomes narrower, because the angle that locate the first dark fringe on either side of the central bright fringe become smaller.

Explanation / Answer

width of slit = w, wavelength = , width of central bright fringe = x, distance between slit and screen = L

the angle that locates the first dark fringe on each side of the central bright fringe =

wsin = ,

x = Ltan

when w is reduced, unchange, so becomes larger, x will be wider.

answer: (c)

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