Diffraction at a double slit and multiple slits

VP5.3.1.2
Diffraction at a double slit and multiple slits
Diffraction at a double slit and multiple slits Interference pattern of experiment P5.3.1.2 on the screen
Diffraction at a double slit and multiple slits

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Description

The experiment P5.3.1.2 explores diffraction at a double slit. The constructive interference of secondary waves from the first slit with secondary waves from the second slit produces intensity maxima; at a given distance d between slit midpoints, the angles jn of these maxima are specified by

The intensities of the various maxima are not constant, as the effect of diffraction at a single slit is superimposed on the diffraction at a double slit. In the case of diffraction at more than two slits with equal spacings d, the positions of the interference maxima remain the same. Between any two maxima, we can also detect N-2 secondary maxima; their intensities decrease for a fixed slit width b and increasing number of slits N.

Components of equipment sets

1 46984  8  Diaphragm with 3 double slits of different slit widths LD
1 46985  8  Diaphragm with 4 double slits of different slit spacing LD
1 46986  8  Diaphragm with 5 multiple slits with different slit numbers LD
1 46022  8  Holder with spring clips LD
1 471830  4  He-Ne Laser, linearly polarised LD
1 46001  8  Lens in frame, f=5 mm LD
1 46002  8  Lens in frame, f=50 mm LD
1 46032  8  Optical bench with standardised profile, 1 m LD
4 460370  8  Optics rider, 60/34 LD
1 44153  8  Screen, translucent LD
1 30011  8  Saddle base LD

Experiment Instructions

PDF (Experiment description) PDF (Experiment description) P5.3.1.2 Diffraction at a double slit and multiple slits
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