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18.2 Diffraction of Light
The bending of waves around corners is called diffraction. If obstacles like a thin wire whose diameter is commensurate with the wave length of light, is placed in the path of a monochromatic beam of light then, within the shadow of the obstacle, the interference pattern can be observed which is due to interference between waves bending around the edges of the wire. Equation (6) can then be used again to determine l; hence X = b and width, d = diameter of wire, D = distance between the wire and the screen. (See figure 5(a), 5(b))
Figure 5 (a)
Figure 5(b)
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18.1 Interference
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