st made plane by the useof a lens, we shall take only the case of plane waves. Ateach surface of the prism, not only refraction occurs, but alsoreflection; but in this discussion we shall ignore the reflectedlight. For the sake of symmetry,Ave call ij the angle of incidenceat the first surface, i\… … sin. l n = sin. r, sm. i2sin. r, / glass Figure 27 where n is the index ofwith respect to air. The drawingshows a series of wavefronts sup-posed to be just one wavelength apart (for instance the lines of the crests) both in theair and in the glass, though of course the actual length of the 60 LIGHT…
Light
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