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Physics Y9 > Eyes > Flashcards

Eyes Flashcards

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1
Q

What does the iris do

A

Makes the pupil larger or smaller depending on the amount of light

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2
Q

Cornea

A

Focus light on the retina

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3
Q

The hole in the eye
Transparent part where light enters or let’s light through

A

Pupil

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4
Q

Lens

A

Part of of focusing process
Muscles around make it thicker or thinner depending on what your looking at

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5
Q

Retina

A

Where the image is formed.Has millions of light sensitive cones(rods and cones)

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6
Q

Sends the image to the brain(electronically)

A

Optic nerve

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7
Q

What is the blind spot and

A

When the image of the retina is also on top of the optic nerve.This point is soo dense with eye nerves that there is no room for light sensitive cells

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8
Q

Why do we see a white circle in between 2 black ones

A

Because are brain treats the black like night vision and is very sensitive.Are eyes look at the white and it is over sensitive and keep sending messages to our brain therefore we ‘see’ a white circle

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9
Q

Why can we sometimes see the word and not others

A

Because we look at the black we can’t see it
We look at white we can see the letters

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10
Q

Tag

A

Towards air glass

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11
Q

Aga

A

Air glass air

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12
Q

What happens when the ray enters the glass at 90

A

Travels straight through

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13
Q

What happens if the ray goes in at a different angle

A

It bends changes direction

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14
Q

What happens when a different angle comes out

A

Bends back to original angle

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15
Q

What is the connection between the ray entering and leaving

A

They are parllel

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16
Q

Refraction

A

When a wave moves through one medium to a different medium and changes speed

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17
Q

TAG =

A

slows down

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18
Q

Glass to air

A

Speeds up

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19
Q

Air to glass

A

Slows down

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20
Q

Light will not ——- when entêteront a different material at 90

A

Bend

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21
Q

What animal needs to understand refraction. To live

A

Archer fish

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22
Q

When rays pass through convex lens they

A

Converge

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23
Q

This converge is called a

A

Converging lens

24
Q

What is the point where to the two lines meet called

A

Principal focus

25
Q

When parallel rays pass through a line they

A

Diverge

26
Q

This lens is known as a

A

Diverging lens

27
Q

What two things happen when you look through a convex lens

A

Upside down
Back to front

28
Q

Is an image through a convex lens clear

A

No blurry and confusing

29
Q

Light from the top of eye focuses on

A

Bottom of retina

30
Q

Light from bottom of image

A

Focuses on top of retina

31
Q

What does the brain do to the image

A

Flip it

32
Q

Converging

A

Cross lines

33
Q

Diverging

A

Out wide lines

34
Q

Light is a mixture of

A

Many different colours

35
Q

The colours can be split into the

A

Spectrum

36
Q

Using a what can light be split

A

A prism

37
Q

Light refracts when entering a glass prism an spreads out In the colours of the spectrum when leaving this is called

A

Dispersion

38
Q

What is the colour spectrum

A

Red. (Richard of York gave battle in vain)
Yellow
Orange
Green
Blue
Indigo
Violet

39
Q

Real life example of dispersion

A

Rainbow

40
Q

What is the electro magnetic spectrum

A

Sèvrerai types of radiation waves

41
Q

Write the 7 types of radiation

A

Gamma rays
X-rays
UV rays
Visible rays
Infrared rays
Microwaves
Radio waves

42
Q

Which type has longest wave length

A

Radio

43
Q

What type is size of atom

A

Gamma

44
Q

Relationship between wavelength and energy

A

Lower wave higher energy

45
Q

Gamma

A

Sterilise fruit and veg and medical equipment
Can damage cells and cause camcer

46
Q

X-ray

A

Bone X-rays,security at airport,X-ray metals for cracks
Damage cells and cause camcer

47
Q

UV

A

Tan beds check bank notes sterilising
Cause cancer and damage cells

48
Q

Visible light

A

Light bulbs,to screen,sun,photography
Overexposure can damage the retina

49
Q

Infrared

A

Might vision goggles,fire heaters,toasters.Tv remotes
Burns skin

50
Q

Microwave

A

Cooks food mobile phones satellites
Can heat tissue at specific frequency

51
Q

Radio

A

Radio,some satellites
No dabger

52
Q

Transverse wave

A

Vibration of particles are perpendicular to the direction of energy

53
Q

Travels at

A

300,000,000m/s vacuum space

54
Q

How do we see

A

Light Travel through the air
Iris control size, of pupil and amount of light let in
The light through the pupil
The light rays are bent(refracted)by the lens
Cornea bends(refracts) light rays is the enter the eye
The Image is focused on the retina which contains light receptor cells
The optic nerve carries the electrical impulse from the eye to the brain.

55
Q

FAST

A

Faster away (the normal)
Slower towards

Physics Y9 (4 decks)

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