When light approaches an object in its path, it behaves in very predictable patterns. When a light wave approaches a boundary, it may change direction and speed up or slow down changing into a wave with a larger or a shorter wavelength. Which of the following examples best illustrates the property of light described in the previous questions?
a) A flashlight beam shining through a window onto a wall.
b) Sunlight reflecting off a mirror and onto a wall.
c) Light passing through a prism and separating into different colors.
d) Moonlight shining through a tree's branches onto the ground.
