A ray of light is incident on the mid-point of a glass prism surface at an angle of
25.0° with respect to the normal. For the glass, n = 1.55, and the prism apex angle
is 40.0°. What is the angle of refraction as the ray enters the air on the far side of
the prism? The surfaces involved are those of the apex angle.
a. 39.4° c. 22.3°
b. 46.0° d. 14.1°