How do I calculate the angle of incidence?

Angle of Light/ Angle of Incidence?

• Red light (n = 1.520) and violet light (n = 1.538) traveling in air are incident on a slab of crown glass. Both colors enter the glass at the same angle of refraction. The red light has an angle of incidence of 34.33°. What is the angle of incidence of the violet light? Give your answer to four significant figures.

• Answer:

  find angle of refraction for red light: sin(34.33)/sin(r) = 1.520/1 sin(r) = sin(34.33)/1.520 find angle of incidence for violet: sin(i)/sin(r) = 1.538/1 sin(i) = 1.538*sin(r) = 1.538*sin(34.33)/1.520 i = 34.7946° <-- incidence angle for violet OG