LIGHT WAVES

Question 1

What term do you use when light passes through an object?

Answer 1

Transmit

Question 2

Which type of object will only allow light to partially pass through?

Answer 2

Translucent

Question 3

In which type of reflection is an image formed?

Answer 3

Specular reflection

Question 4

Describe why a lamp is a luminous object.

Answer 4

As it gives off light

Question 5

What does the law of reflection say?

Answer 5

That the angle of incidence will be equal to the angle of reflection

Question 6

What is meant by a light-year?

Answer 6

The amount of distance that light travels in one year

Question 7

How will the direction of light change if it is moving from air into a glass block?

Answer 7

It will bend towards the normal as it is slowing down as it enters the glass block

Question 8

Describe the difference between primary and secondary colours.

Answer 8

Primary colours are the ones that your eyes detect, whereas secondary colours are made from mixing primary colours together

Question 9

Explain why light passing through a green filter appears green.

Answer 9

All other colours of light are absorbed, and only green light is allowed to pass through

Question 10

How can your eyes detect an object?

Answer 10

Light hits the photoreceptors at the back of your eye; this is turned into an electrical impulse that is sent along the optic nerve to the brain

Question 11

What is the role of the lens in your eye?

Answer 11

It focuses the light entering your eye and enables you to see

Question 12

When you look through a window and light goes through your eyes, what is the glass doing?

Answer 12

Transmitting the light

Question 13

What do you call materials that don’t transmit light?

Answer 13

opaque

Question 14

What does light travel as?

Answer 14

Wave

Question 15

can light go through a vacuum(empty space)?

Answer 15

Yes

Question 16

Is light-time time or distance?

Answer 16

Distance

Question 17

How fast does light travel?

Answer 17

300,000km/s

Question 18

Is the reflection in a mirror virtual or real?

Answer 18

VIRTUAl

Question 19

Is plane mirror strait or curvy

Answer 19

Strait

Question 20

The ray that hits the mirror from your ray box is called?

Answer 20

incident ray

Question 21

x

Answer 21

reflected ray

Question 22

Every surface realeases some(?)

Answer 22

light

Question 23

reflection of a smooth surface is called?

Answer 23

specualr reflection

Question 24

reflection of a rough surface is called?

Answer 24

diffuse scattering

Question 25

To form an image what do you need?

Answer 25

the rays from each part of the object have to reflect off an object in the same way in same angle

Question 26

If light changes direction what is this called through different mediums(material)?

Answer 26

refraction

Question 27

What is the lens called in your body?

Answer 27

convex or converging lens

Question 28

What is the point where all the rays meet in the lens called?

Answer 28

focus or focal point

Question 29

How can we see?

Answer 29

When you look at a tree, the immage of a tree is formed in your retina of your eyes. Light reflected off the tree goes throuh your pupil. The cornea(transparent part of the outer part of your eye)and the lens focus light onto your retina. The image is inverted(flipped over) at first but the brain sorts it out so it looks normal.

Question 30

how does the iris work?

Answer 30

Its a muscle that controls the size of your pupil.