A light ray travelling from diamond into air has an angle of

refraction of 56°. A piece of glass is then placed right next

to the diamond.

(a) How will the angle of refraction change?

The angle of refraction can be computed using Snell's Law: n1*sin θ1 = n2*sin θ2, wherein n1 and n2 refer to the refractive index of mediums 1 and 2, respectively and θ1 and θ2 are the angles of refraction. The refractive index of air it is 1.00029 and for glass it's 1.52. Using the formula and the given values, the angle of reaction due to glass is 33.06 degrees.