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What is light?

• A type of sound wave.

• An electromagnetic wave that can be seen by the human eye.

• A form of energy that can only be felt as heat.

• A wave that can only be detected by special instruments.

Which of the following are natural sources of light?

• Lamps and flashlights.

• The Moon, because it emits its own light.

• The Sun, stars, and bioluminescent organisms.

• Televisions and computer screens.

What happens when light strikes a smooth, flat surface like a mirror?

• It is absorbed by the surface.

• It passes through the surface.

• It is reflected, with the angle of incidence equal to the angle of reflection.

• It changes color.

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What property of light allows us to see objects through clear materials like glass or water?

• Light can be reflected.

• Light can be refracted.

• Light can penetrate clear objects.

• Light travels in straight lines.

Why does a pencil appear bent when partially submerged in water?

• Light travels faster in water than in air.

• Light is reflected by the water's surface.

• Light is dispersed into different colors.

• Light changes speed and bends when passing from one medium to another.