Red light (n=1.520) and violet light (n=1.538) traveling inair are incident on a

Question

Red light (n=1.520) and violet light (n=1.538) traveling inair are incident on a slab of crown glass. Both colors enter theglass at the same angle of refraction. The red light has an angleof incidence of 30.00 degrees. What is the angle of incidence ofthe violet light? I'm not sure where to start. Red light (n=1.520) and violet light (n=1.538) traveling inair are incident on a slab of crown glass. Both colors enter theglass at the same angle of refraction. The red light has an angleof incidence of 30.00 degrees. What is the angle of incidence ofthe violet light? I'm not sure where to start.

Explanation / Answer

sinRed light (n=1.520) and violet light (n=1.538)traveling in air are incident on a slab of crown glass. Both colorsenter the glass at the same angle of refraction. The red light hasan angle of incidence of 30.00 degrees. What is the angle ofincidence of the violet light? angle of refraction for red light=r
sini/sinr=1.52
sin30/1.52=sinr
so angle of refraction=r=19.20degree
so as angle of refraction for both colours is same angle ofrefraction for violet colour=19.20 degree
sini/sin19.20=1.538
so angle of incidence for violet colour=30.39degree.

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