A small vertical mirror hangs on the wall, 1.40 m above the floor. Sunlight strikes the mirror, and the reflected beam forms a spot on the floor 2.50 m from the wall. Later in the day, you notice that the spot has moved to a point 3.75 m from the wall.
(a) Were your two observations made in the morning or in the afternoon? Explain.
(b) What was the change in the Sun's angle of elevation between your two observations?