A thin beam of white light is directed at a

A thin beam of white light is directed at a flat sheet of silicate flint glass at an angle of 20.0° to the surface of the sheet. Due to dispersion in the glass, the beam is spread out as shown in a spectrum in Fig. 33.58. The refractive index of silicate flint glass versus wavelength is graphed in Fig. 33.18.
(a) The rays a and b shown in Fig. 33.58 correspond to the extremes of the visible spectrum. Which corresponds to red and which to violet? Explain your reasoning.
(b) For what thickness d of the glass sheet will the spectrum he 1.0 mm wide, as shown (see Problem33.58)?

20.0 Silicate flint glass Vacuum Vacuum 1.0 mm-


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