Exclusive Single Slit Diffraction

The slide is about single slit diffraction. this slide gives a complete presentataion on the same. it also contains interesting pictures to get a better idea of the topic.

1. SINGLE SLIT DIFFRACTION

2. CONTENTS 1. DIFFRACTION 2. SINGLE SLIT DIFFRACTION 3. ANALYSING SINGLE SLIT DIFFRACTION 4. CONDITION FOR DIFFRACTION MINIMA AND MAXIMA 5. INTENSITY DISTRIBUTION OF DIFFRACTED LIGHT

3. Diffraction is the slight bending of light as it passes around the edge of an object. The amount of bending depends on the relative size of the wavelength of light to the size of the opening . DIFFRACTION

4. SINGLE SLIT DIFFRACTION When light passes through a small slit, it spreads out and produces a diffraction pattern showing a principle peak with subsidiary maxima and minima of decreasing intensity.

5. ANALYSING SINGLE SLIT DIFFRACTION FIG. EXPERIMENTAL SETUP OF SINGLE SLIT DIFFRACTION.

6. DIFFRACTION BY SINGLE SLIT

7. For an open slit of width a , subdivide the opening into segments and imagine a Hyugens wavelet originating from the center of each segment. The wavelets going forward ( q =0) all travel the same distance to the screen and interfere constructively to produce the central maximum.

8. Now consider the wavelets going at an angle such that l = a sin q = a q . The wavelet pair (1, 2) has a path length difference D r 12 = l /2, and therefore will cancel. The same is true of wavelet pairs (3,4), (5,6), etc. Moreover, if the aperture is divided into p sub-parts, this procedure can be applied to each sub-part. This procedure locates all of the dark fringes.

9. CONDITION FOR DIFFRACTION MINIMA AND MAXIMA

10. INTENSITY DISTRIBUTION OF DIFFRACTED LIGHT When the light is diffracted by a single slit then a diffraction pattern is formed having a central maxima and subsidiary principle maxima and minima as shown in the above figures.

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