Grade 8 Physics Light Quiz

What is the law of reflection?

• The angle of incidence is equal to the angle of reflection.

• The angle of incidence is greater than the angle of reflection.

• The angle of reflection is perpendicular to the angle of incidence.

• The angle of reflection is less than the angle of incidence.

Explain how a mirror reflects light.

• The mirror absorbs the light and then emits it back out

• The mirror creates its own light to reflect

• The mirror changes the direction of the light by bending it

• The smooth surface of a mirror reflects light by following the law of reflection.

Name two examples of opaque materials.

• Paper, cardboard

• Wood, metal

• Air, water

• Glass, plastic

Why can't we see through opaque materials?

• Because their dense and tightly packed molecular structure absorbs or reflects light instead of allowing it to pass through.

• Because they are too bright to see through

• Because they are too heavy to see through

• Because they are made of transparent materials

Give two examples of translucent materials.

• Aluminum foil, cardboard

• Wood, plastic

• Steel, concrete

• Frosted glass, wax paper

What happens when light passes through a translucent material?

• It changes the color of the light and becomes a different color.

• It reflects all the light and becomes very bright.

• It absorbs all the light and becomes completely dark.

• It scatters in different directions and some of it is transmitted through the material.

Provide two examples of transparent materials.

• Brick, paper

• Glass, water

• Plastic, concrete

• Wood, metal

How do transparent materials allow light to pass through them?

• Their atoms are arranged in a way that allows light to travel through without being absorbed or scattered.

• They absorb all the light that passes through them

• Their atoms are arranged in a way that reflects light in all directions

• They generate their own light to pass through them

What is the relationship between light and energy?

• Light is a form of energy

• Light is a type of sound

• Light has no relationship with energy

• Light is a form of matter

Explain how light can be converted into other forms of energy.

• By converting light into sound waves

• Through processes such as photovoltaic effect in solar panels, photochemical reactions, and the generation of heat in objects that absorb light.

• Through the process of condensation

• By transforming light into magnetic energy