Lý 7

Question 1: Which of the following phenomena is not related to light energy?

• Sunlight reflects on water

• Sunlight burns the skin

• Solar cookers heat up thanks to sunlight

• Sunlight is used to generate electricity

Question 2: Which of the following statements is false?

• The Sun is the main source of light energy and heat energy on Earth

• Light energy is needed for plant growth

• Light has no energy because it exerts no force

• Light energy can be converted into heat

Which of the following statements is correct?

• Light rays are curves

• Light rays are always parallel

• Light rays tell us how fast or slow light travels

• The path of light is represented by a straight line with an arrow indicating the direction of light propagation called a light ray

Fill in the blanks: Parallel light beams include light rays……………… on their paths.

• Intersecting

• Non-intersecting

• Flared

Which of the following pictures represents a converging beam?

• a

• b

• c

• d

What is the dark area?

• It is an area that completely does not receive light from the incoming light source

• It is an area that only receives part of the light from the incoming light source

• It is the area that completely receives light from the incoming light source

• It is the area in front of the obstacle and receives light

Choose the incorrect statement. What is an object that blocks light?

• Does not allow light to pass through

• Placed before the observer's eyes

• Block the path of light

• Supports light transmission

Light is a form of .........

What is an opaque object?

• Glass

• Book

• Plastic wrap

• towel

The penumbra is the area behind the obstacle, completely receiving no ........ from the incoming light source.