Brainscape's Knowledge GenomeTM

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


See full index

English > Optics - Refraction > Flashcards

Optics - Refraction Flashcards

You may prefer our related Brainscape-certified flashcards:
Proverbs and Idioms flashcards
1
Q

If the light travels from a “fast” medium to a “slow” medium it bends towards or away from the normal?

A

FST - towards

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

If the light travels from a “slow” medium to a “fast” medium it bends towards or away from the normal?

A

SFA - away

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

What is total internal reflection

A

When a wave from a slow medium to a fast medium enters at a degree larger than the incident angle, the wave can be trapped inside the slow medium

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

What is critical angle

A

When the angle of incidence results in the angle of refraction to be 90* to the normal (on the boundary line)

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

What are examples of refraction phenomenon?

A

Apparent depth: the illusion the object is closer then it appears because our brains can only trace back the reflected Rays - called the apparent depth
The mirage(flattened sun): you think you see something but it is just the displacement of light reflected off objects
Rainbows: each colour bends at a different speed and can only be seen when the sun is behind you

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

Examples of total internal reflection

A
  1. Right angle prisms: 90v- periscope, 180 - binoculars, bike reflectors
  2. Diamonds: the critical angle for a diamond is 24* and light wave trying to escape must do so at a angle less then 24* and degree higher will totally internally reflect
  3. Fibber optics: the light always hits the walls at an angle greater then the critical angle so it stays in the glass cylinder
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Light does not reflect when it has an angle of:

A

0* it goes straight through

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

Rules for converging mirrors

A

1: a ray parallel to the PA will refract through PF
2: a ray through SF will refract parallel
3: a ray through the optic centre will continue unrefracted

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

Rules for diverging mirrors

A
  1. a ray that us parallel to the PA will refract as I’d it came from PF
    2: a ray that appears to go through sf will refract parallel to the PA
    3 a ray that goes through the optic centre will continue unrefracted
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What is a lens?

A

A thin transparent piece of glass with at ,east one curved side

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

What can lenses do

A

Can make images appear:

  • smaller/larger
  • inverted
  • upside down
  • misshapen
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

PF(F)

A

Principal focal point

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

SF(F’)

A

Secondary focal point

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

2F

A

Twice the length of the focal point

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

F

A

Focal length: for the lens to the focal point

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

PA

A

Principal Axis

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

O

A

Optical centre (lens centre)

18
Q

Use for converging lenses

A

Magnifying glass: put an object between SF and the lens to get a larger upright virtual image
Spotlight: put the beam at SF to produce a beam of parallel Rays
Projector: put object between SF and 2F the image will be larger, real and upside down. ~film must be loaded upside down
The camera: put the object beyond 2F of lens and a small inverted real image forms on the film or sensor
-farsightedness

19
Q

Use for diverging lenses

A

Peepholes: as you look through the hole a smaller virtual image of the room are displayed in the lens
-nearsighted

20
Q

Do

A

Distance from the object to the optical centre

21
Q

Do

A

Distance of the image from the optical centre

22
Q

Ho

A

Height of the object

23
Q

Hi

A

Height of the image

24
Q

F

A

Focal length of the lens; distance of the optical centre to the PF

25
Q

Thin lens equation conventions

A
  • the Do is always positive
  • di are pos for real images and neg for virtual
  • f is Pos for converging lenses and neg for diverging lenses
26
Q

When the lens is converging the object is on the _____ side

A

SF

27
Q

When the lens is diverging the object is on the _____ side

A

PF

28
Q

Looking at a near object the ciliary muscles

A

Contract and make the lens short and fat

29
Q

Looking at far objects the ciliary muscles

A

Relax and make the lens long and thin

30
Q

Cornea

A

Light from an object enters the eye through the cornea. It does almost all of the light bending

31
Q

Pupil

A

The light goes through the pupil which is a small opening

32
Q

Iris

A

The iris is the coloured part of the eye that opens and closes to control the amount of light

33
Q

Lens

A

The light then enters the lens and is bent slightly. The lens can change shape to bend he light rays more or less to produce a clear image

34
Q

The ciliary muscles

A

The ciliary muscles are responsible for changing the shape of the lens

35
Q

Rentina

A

The retina is on the back wall of the eye. The light energy is converted to electrical impulses by the photosensitive cells of the retina

36
Q

Optic nerve

A

The optic nerve connects the eye to the brain. The brain takes the small inverted image and creates a flipped upright image

37
Q

Red eye in flash photography

A
  • light reflects off retinas
  • purpose of double flash: flash causes pupils to contact so less light reflects off the retina
  • no double flash > turn on more light so make pupils smaller
38
Q

The human eye accommodation

A

The lens of the eye can change shape. This allows you to see things that are near and also to see things far away

39
Q

Nearsightedness

A

You can see close but not far away. The lens bends the light too much and the image forms before the retina. A divergent lens corrects this problem by spreading the light rays out before they enter the eye

40
Q

Farsightedness

A

You can see far but not close. Lens bends light too little and the image is formed behind the retina. A converging lens can fix this problem by focusing the Rays before they enter the eye.

41
Q

Define refraction

A

Reflection is when a light wave travels from one medium into a different one at an angle, and the light bends.

42
Q

Magnification

A

Has no units
If it is larger than 1 the image is larger than the object
If it is smaller than 1 the image is smaller then the object
It is pos for upright image and neg for an inverted image

English (4 decks)

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