4.3 Double-Slit Diffraction

Interference fringes modulated by the single-slit envelope once the slits have real width, relative fringe intensities, and the orders that go missing.

University Physics Volume 3, 4.3 Double-Slit Diffraction

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4 exercises

4.3 Exercise 1

For the experiment in the example, show that $m = 20$ is also a missing order.

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4.3 Exercise 4

A double slit produces a diffraction pattern that is a combination of single- and double-slit interference. Find the ratio of the width of the slits to the separation between them, if the first minimum of the single-slit pattern falls on the fifth maximum of the double-slit pattern. (This will greatly reduce the intensity of the fifth maximum.)

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4.3 Exercise 6

Light of wavelength 500 nm falls normally on 50 slits that are $2.5 \times 10^{−3} \text{mm}$ wide and spaced $5.0 \times 10^{−3} \text{mm}$ apart. How many interference fringes lie in the central peak of the diffraction pattern?

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4.3 Exercise 8

When a monochromatic light of wavelength 430 nm incident on a double slit of slit separation $5 \mu \text{m}$ , there are 11 interference fringes in its central maximum. How many interference fringes will be in the central maximum of a light of the same wavelength and slit widths, but a new slit separation of $4 \mu \text{m}$ ?

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