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A slim beam of white light traveling in air strikes one face of a slab of...

A slim beam of white light traveling in air strikes one face of a slab of silicate flint glass with an angle of incidence of 35 degrees . Within the glass, through what angle, is the portion of the visible spectrum between 380 nm and 740 nm dispersed? Use n380nm = 1.68 and n740nm = 1.61.

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