For some types of glass, the index of refraction varies with wavelength. A prism made of a material with where 0 is the wavelength in vacuum, was used to disperse white light as shown in Fig. 8-34 (P8.18). The white light is incident at an angle of 50_, the wavelength 0 of red light is 0:7 μm and that of violet light is 0:4 μm. Determine the angular dispersion in degrees.

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-20, (Ao in m), 30 n = 1.71 Angular dispersion 60° Red Green 50°t Violet