1. The colors in a rainbow are caused by
(a) The interaction of the light reflected from different raindrops.
(b) Different amounts of absorption for light of different colors by the water in the raindrops.
(c) Different amounts of refraction for light of different colors by the water in the raindrops.
(d) The downward motion of the raindrops.
2. A double-slit experiment yields an interference pattern due to the path length difference from light traveling through one slit versus the other. Why does a single slit show a diffraction pattern?
(a) There is a path length difference from waves originating at different parts of the slit.
(b) The wavelength of the light is shorter than the slit.
(c) The light passing through the slit interferes with light that does not pass through.
(d) The single slit must have something in the middle of it, causing it to act like a double slit.