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A two-slit pattern is viewed on a screen 1.00 mm from the slits. If the two...

A two-slit pattern is viewed on a screen 1.00 mm from the slits.

If the two third-order minima are 17.0 cmcm apart, what is the width of the central bright fringe?

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Answer #1

Distance of screen from the slits, L = 1 m

two third order minima = 17 cm = 0.17m

Position of third order minima from the center point is t = 5L/2d

distance between the two third order minima is

y = 2 x (5L/2d)

y = 5L/d...................................................................................eq1

width of the central bright fringe is w = L/d............................eq2

using eq1 and eq2 for solving w

w = y/5

w = 17/5

w = 3.4 cm

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