A ray of light is incident on the mid-point of a glass prism surface at an angle of 20° with the normal. For the glass, n = 1.60, and the prism apex angle is 40°. What is the angle of incidence at the glass-to-air surface on the side opposite where the ray exits the prism? The surfaces involved are those of the apex angle
a. 12.3°
c. 22.7°
b. 38.0°
d. 27.7°
D
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A cube is 1.0 inch in length on the side (1 in = 2.540 cm). The volume of the cube is
a. 
b. 
c. 
d. 