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In class, a pattern was produced on the wall by putting a laser beam through two thin slits. Suppose that the width of the individual slits, *a*, were much less than the separation between the slits, *d*.

- Given the scale of the parameters you observed in class, draw a
__diagram__of the light that is responsible for the illumination at a particular point on the screen (right-hand wall of the lecture hall). What approximations would be useful for calculating the interference pattern produced? - Assuming that
*d*>>*a*, sketch a__picture__of the pattern that would be observed. What is the angular width of the central peak? Be sure to define any terms you introduce. - Now suppose that we replace the slits with another set that has
*d*= 2*a*. Draw a__graph__of the light intensity of the resulting pattern as a function of angle. Do it carefully, showing the angles at which the first two zeros occur.

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Page last modified November 5, 2002: OP25