Reflection and Refraction of Light: Refracted Light

The video explains how certain visual phenomena, such as the sun appearing oval at dusk or dawn, mountain streams seeming shallower, and roads shimmering in the desert, are caused by the refraction of light. Refraction occurs when light waves pass from one substance to another, changing velocity and bending the light. The degree of bending is determined by the index of refraction, which varies between substances. For example, light travels 33% slower in water than in a vacuum, as indicated by water's refraction index of 1.33.

Why does the sun appear oval when it is low in the sky?

• Due to the sun's actual shape

• Due to the refraction of light

• Because of the Earth's rotation

• Because of atmospheric pressure

What happens to light waves when they pass from one substance to another?

• They increase in speed

• They change color

• Their velocity changes

• They disappear

What determines how much light is bent when it passes through a substance?

• The temperature of the substance

• The color of the light

• The angle of incidence

• The change in velocity

What is the index of refraction for the vacuum of space?

• 2

• 0

• 1

• 1.33

How much slower does light travel through water compared to space?

• 25% slower

• 33% slower

• 10% slower

• 50% slower