Light Energy

Question 0

Non-luminous

Answer 0

Most objects that you see are non-luminous

Question 1

Luminous

Answer 1

Emit light

Eg flame of a burning match

Question 2

Opaque

Answer 2

Substances that absorb or reflect all the light striking them

Question 3

Transparent

Answer 3

Most light travels through the substance

Question 4

Translucent

Answer 4

Let just enough light through to enable you detect objects on the other side, but scatter so much light that you can’t see them clearly

Question 5

Refraction

Answer 5

When light travels from one substance into another

Refraction causes light to bend

Question 6

Plane mirriors

Answer 6

If a single light ray hits a plane mirror at an angle, it will bounce off - it will reflect at the same angle

Question 7

Incident Ray

Answer 7

The Ray that hits the mirror is called the incident ray

Question 8

Reflected Ray

Answer 8

The Ray that bounces off the mirror is called the reflected ray

Question 9

Normal

Answer 9

The imaginary line that makes a 90 degree angle to the surface is called the normal

Question 10

Concave mirror

Answer 10

In a concave mirror, light is reflected inwards and comes to a point.
Light rays are said to converge

Question 11

Concave mirror image

Answer 11

The image is large and the right way up I’d the object if close to the mirror
Or
The image can be small and upside down if the object is away from the mirror

Question 12

Example of concave mirror

Answer 12

Dentist mirrors

Question 13

Convex mirror

Answer 13

In convex mirrors, light spreads out and so are said to diverge
The image is always smaller and the right way up

Question 14

Concave mirrors are also known as

Answer 14

converging mirrors

Question 15

Convex mirrors are also called

Answer 15

Diverging mirrors

Question 16

Uses of convex mirrors

Answer 16

Convex mirrors are used so that shops can keep all areas of the store in sight - security mirrors, street corners

Question 17

Concave lenses

Answer 17

A convex lens can focus the light that enters it and direct it to one point

Question 18

Concave lenses

Answer 18

Concave lenses make light rays move away each other or spread out

Question 19

Concave lens produce

Answer 19

Upright images that are smaller than real objects

Question 20

Convex lenses

If the object is

Answer 20

If the object is far: the image is formed upside down and small
If the object is close: the image is formed large and upright

Question 21

Examples of convex lenses

Answer 21

Magnifying glass
Telescopes
Microscopes
Cameras