Snell's law tells us about the relationship be- tween the angle of incidence, 1, and the angle of refraction, 62, as a ray of light travels from one medium to another and depends on the refrac- Air (71) tion indices n, and n2 of both of the substance. Snell's Law n, sin(01) = n2 sin(02) (a) Which letters represent variables? Glass (n2) (b) Which letters represent constants? (c) (D9) Use Implicit differentiation to compute d02 (d) The refraction index of air is m = 1 and the refraction index of glass is no = 1.52. If the angle of incidence is 61 = 20 verify that the angle of refraction is approximately 62 2 13 (Make sure you calculator is in degrees mode, and just plug in numbers to verify the equation balances.) (e) (D10) Find an equation for the tangent line when of = 20" and 02 = 139 (f) (D10) Use your tangent line to approximate the value of 6, when 0 = 210