Light

Question 1

Speed of light

Answer 1

300,000km/hr

Question 2

What travels just as fast as light?

Answer 2

Electromagnetic radiation

Question 3

What is light made up of?

Answer 3

Photons which are particles that travel as a wave

Question 4

What kind of energy is light?

Answer 4

radiant energy

Question 5

Purpose of the electromagnetic spectrum

Answer 5

To show us the different types of light

Question 6

What kind of wave is light?

Answer 6

Transverse wave

Question 7

What is light?

Answer 7

Energy that travels as an electromagnetic wave

Question 8

When light hits a wave, what are the 3 things that can happen?

Answer 8

It can be transmitted, reflected or absorbed

Question 9

What happens when light is transmitted

Answer 9

When light passes through the object

Question 10

What happens when light is reflected

Answer 10

light bounces off the object

Question 11

What happens when light is absorbed

Answer 11

When light is taken into the object

Question 12

Transparent objects

Answer 12

Materials like glass that allow light to pass through them

Question 13

Transculent objects

Answer 13

• Objects that allow only some light to be pass-through

- can’t see through objects clearly like a foggy mirror or clouds

Question 14

Opaque objects

Answer 14

Objects that absorb or reflect all light eg. concrete floor

or that light can’t pass through at all

Question 15

What depends on how reflective an object is

Answer 15

how reflective an object depends on how smooth the surface is

Question 16

Law of reflection

Answer 16

Angle of incidence=Angle of reflection

Question 17

Incident ray

Answer 17

Ray of light that hits a surface

Question 18

Angle of reflection

Answer 18

Angle between the reflected ray and the normal

Question 19

Whats the normal

Answer 19

The imaginary line drawn perpendicular to the mirror

Question 20

Angle of incidence:

Answer 20

Angle between the incident ray and the normal

Question 21

Reflected ray

Answer 21

A ray of light that leaves the mirror

Question 22

Plane mirrors

Answer 22

Plane mirrors are flat mirrors that produce a virtual image

Question 23

refraction

Answer 23

is the bending of light rays that occur when light at angle travels from one medium to another of different density

Question 24

when does light bend

Answer 24

Light bends when it changes speed

Question 25

Virtual images

Answer 25

Images that are reversed

Question 26

Refracted Ray

Answer 26

The bent ray

Question 27

What happens when light enters a denser medium

Answer 27

The light ray slows down and bends towards the normal

Question 28

What happens when a light ray enters a less dense medium

Answer 28

The light ray speeds up and bends away from the normal.

Question 29

The lower the refractive index....

Answer 29

The less dense the medium is and the faster light travels through it.

Question 30

When does the light not bend?

Answer 30

Light doesn't bend when it enters a new medium of 90 degrees.

Question 31

Convex lenses

Answer 31

Convex lenses at the centre than the edges and cause light rays to converge.

Question 32

The focus point

Answer 32

Where the rays meet or cross

Question 33

Concave lenses

Answer 33

Concave lenses are thinner at the centre than at the edges and cause light rays to diverge

Question 34

What is the result of refraction

Answer 34

the bending of light rays

Question 35

Lens

Answer 35

A curved piece of transparent material such as glass or plastic

Question 36

Focal length of convex lens

Answer 36

Focal length is the distance from the focus to the middle of the lens for the convex lens

Question 37

Focal length of concave lense

Answer 37

Focal length is from the left side of the focus to the middle of the lense

Question 38

What lens has a virtual focus point

Answer 38

Concave lens

Question 39

What does the amount of refraction depend on

Answer 39

The amount of refraction that takes place depends upon the angle that the light ray hits the surface of an object. Lenses make use of this to bring rays to a point.

Question 40

What is a magnifying lens

Answer 40

Concave lens

Question 41

What should a ray diagram start with

Answer 41

A light source

Question 42

how refraction of light through transparent materials occurs,

Answer 42

Transparent materials have a less dense medium causing light rays to speed up. When light rays speed up they refract.

Question 43

how refractive index determines if the light is refracted towards or away from the normal.

Answer 43

Whether the light rays bend towards or away from the normal is determined by the refractive index. When light rays enter a denser medium, they bend towards the normal and when they enter a less dense medium they bend away from the normal.

Question 44

Light sensitive back of the eye

Answer 44

Retina

Question 45

Rocks at the bottom of a stream always look like they are in shallower water than they actually are. This is caused by?

Answer 45

refraction