Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Year 12 > Light > Flashcards

Light Flashcards

1
Q

Which colour of light has the least and most refraction in order of wave length

A

Red = least
Violet = most
Rainbow in between

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

When white light is shone through prism what is produced

A

A spectrum

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Why are spectrums produced

A

As different colours travel at different speeds in glass

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What is important about reflection of light?

A

Angle of incidence = angle of reflection

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What are 2 types of reflection

A

Regular and diffuse

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What can u say about an image

A

It’s virtual
It’s the same size as the object
It’s laterally inverted
It’s the same distance behind the mirror as the object is in front

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What is a virtual image

A

a virtual image is the collection of focus points made by extensions of diverging rays

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What can u say about refraction of light going from air to glass and water

A

It slows in glass and water going from air

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What happens when light slows

A

It bends towards the normal

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What happens when light speeds up

A

It bends towards the normal

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What conclusion do u get about the relationship between the angle of incidence and the angle of reflection

A

This tells us that i is not directly proportional to r (because the graph is not a straight line), but that i and r have a positive correlation (as i increases, r increases).

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What conditions are there for TIR To occur in a semi-circular glass block

A

Angle of incidence is increased passed the refracted ray angle

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

When does TIR occur

A

When the angle of incidence in the glass is greater than the critical angle

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

In terms of TIR how do optical fibres enable long distance communication

A

So long as the fibre isn’t bent too tightly light will strike the boundary at an angle greater than the critical angle and be totally internally reflected at the surface

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What does a converging lens do

A

It converges rays parallel to the central axis to the same point on the opposite side of the lens

This point is called the principal focus

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What does a diverging lens do

A

It diverges Rays parallel to the principal axis so that they appear to be diverging from the same point after refraction in the lens

This point is called the principal focus

17
Q

Define the focal length of a converging lens

A

The focal length is from the centre of the lens to the principal focus in front of the lens

18
Q

Define the focal length of a diverging lens

A

The focal length is from the centre of the lens to the principal focus behind the lens

19
Q

Where are the 2 main focii for lenses

A

On either side of the lens

20
Q

Describe an experiment that uses a distant object to measure the focal length of a converging lens

A

Tape a ruler to a table
Place a white screen in a holder at the zero mark then place the convex lens in a holder as close as possible to the screen
Slowly move the lens away from the screen until the inverted image of a distant image eg a tree is as clear as possible
Record the number at which the lens is at. This is the focal length
Repeat these steps 3 more times and get an avg value for the focal length of the lens

21
Q

Can real images be focused onto a screen

A

Yes

22
Q

Can virtual images be focused onto a screen

A

No

23
Q

What is the principal of a simple camera

A

Camera gives a diminished real image

24
Q

What is the principal of a projecter

A

Projector gives a magnified real image

25
Q

What happens When the angle of incidence in the glass reaches the critical angle

A

the angle of refraction in the air becomes 90 degrees

26
Q

How does short sightedness usually occur

A

When the eye grows slightly too long so that light doesn’t focus on the retina properly

27
Q

Where do the light rays focus for a short sighted person

A

Just in front of the retina, resulting in distant objects appearing blurred

28
Q

How does long sightedness usually occur

A

When the eyeball is too short or the lens can’t be made thick enough to focus the light rays on the retina

29
Q

Where do the light rays focus for a long sighted person

A

They focus behind the retina so nearby objects appear blurred

30
Q

What lens corrects short sightedness

A

Concave (diverging)

31
Q

What lens corrects short sightedness

A

Convex (converging)

Year 12 (7 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions