Light

Question 1

Energy

Answer 1

Is the ability to do work i.e. move. Unit of energy is the joule.

Question 2

Plants use of light

Answer 2

To make food (Photosynthesis)

Question 3

Humans use of light

Answer 3

Solar panels and Crooke’s radiometer

Question 4

Luminous

Answer 4

Gives off light

Question 5

Non-luminous

Answer 5

Doesn’t give off light

Question 6

Light

Answer 6

Is a form of energy

Question 7

Refraction

Answer 7

The bending of light as it goes from one medium to another e.g. air to water. Light rays are refracted towards the denser material.

Question 8

Convex or converging lens

Answer 8

Used to bring rays together.

Used to fix long sightedness, or hypermetropia.

Question 9

Concave or diverging lens

Answer 9

Used to spread rays apart.

Used to fix short sightedness, or myopia.

Question 10

White light

Answer 10

White light is not really white. It is a mixture of the 7 colours of the spectrum.

Question 11

Dispersion

Answer 11

Is the splitting of white light onto its constituent colours due to refraction.