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science revision > Light > Flashcards

Light Flashcards

1
Q

Light is a form of…

A

energy

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2
Q

Light travels in…

A

waves

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3
Q

Light doesn’t need …? to move

A

matter

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4
Q

What is the speed of light?

A

about 300,000 km/s

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5
Q

The height of the light waves is the…

A

amplitude

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6
Q

The top of the light wave is called the…

A

crest

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7
Q

The bottom of the light wave is called the…

A

trough

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8
Q

The wavelength distance is…

A

crest to crest, or trough to trough

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9
Q

Short wavelengths have a…

A

high frequency

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10
Q

Long wavelengths have a…

A

low frequency

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11
Q

The 7 types of EMS radiation

A

Radio waves
Microwaves
Infrared
Visible light
Ultraviolet
X-rays
Gamma rays

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12
Q

Luminous objects…

A

produce light

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13
Q

Non-luminous objects…

A

reflect light

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14
Q

Transmitted light…

A

passes through transparent objects

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15
Q

Reflected light…

A

bounces off objects

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16
Q

Objects that absorb light…

A

take the energy and convert it to heat energy

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17
Q

White light is formed by…

A

all the colours being combined/reflected off an object

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18
Q

Objects appear black when…

A

they absorb all the colours of the spectrum

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19
Q

Objects appear certain colours when they…

A

reflect that colour and absorb all the others

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20
Q

Regular Reflection

A

Plane (flat) mirrors reflect light in a regular way (at the same angle)

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21
Q

Diffuse Reflection

A

Most objects reflect irregular because their surface is not perfectly smooth. Light is reflected in all directions.

22
Q

Lateral inversion…

A

occurs when looking at a plane mirror and the writing appears backwards

23
Q

The Law of Reflection

A

Angle of Incidence = Angle of Reflection/Light is always reflected away at the same angle that is strikes a mirror

24
Q

Refraction is…

A

the bending of light

25
Q

Medium

A

is a substance through which light travel can travel

26
Q

Plural of medium

A

media

27
Q

Refraction Index

A

the density of objects can affect the speed that light can travel

27
Q

MTLA

A

When entering a More dense medium the light ray bends Towards the normal. When entering a Less dense medium the light ray bends Away from the normal.

28
Q

Lenses

A

lenses are shaped so that light passing through them is refracted (bent) in a particular way

29
Q

Real image

A

A real image is produced on a screen when all of the rays from a single point on an object strike a single point on the screen/they have a visible focal point where all rays meet

30
Q

Virtual image

A

A virtual image is produced when the rays of light that reach our eyes that appear to come from a real object, but there is no object at the apparent source of the light/the focal point is imagined by finding where the rays would meet, if they could.

31
Q

Convex Lenses

A

When light passes through a convex lens, the light rays converge

32
Q

Will light passing through a convex lens make a Real or Virtual image?

A

a real image bc they converge at a visible focal point

33
Q

Concave Lenses

A

When light passes through a concave lens, the light rays diverge

34
Q

Will light passing through a concave lens make a Real or Virtual image?

A

Virtual bc there is no visible focal point you can only find the focal point where the rays would meet if they could

35
Q

Cornea

A

Clear window, refracts light, helps to focus the light

36
Q

Pupil

A

Hole in the iris, which allows light to enter the eye

37
Q

Iris

A

Coloured, changes size to control the amount of light entering the eye

38
Q

Lens

A

Refracts light to focus image on the retina. Focal length adjusted by ciliary muscles

39
Q

Retina

A

Light sensitive cells (rods & cones) which change light energy to nerve impulses.

40
Q

Optical nerve

A

Takes messages from the retina to the brain

41
Q

Sclera

A

The white, tough outer layer that protects the eye. Choroid: black layer of blood vessels.

42
Q

Liquid humour

A

Watery at the front (Aqueous humour), jelly at the back (Vitreas humour), helps to keep eye’s shape and provide medium for light to travel through.

43
Q

More light is let in when the pupil is…

A

dilated

44
Q

Less light is let in when the pupil is…

A

constricted

45
Q

Rods and cones are types of…

A

photoreceptors

46
Q

Order the visible colours longest to shortest wavelength

A

Red, Orange, Yellow, Green, Blue, Indigo, Violet

47
Q

What is frequency?

A

how many waves per second

48
Q

What is the period of a wave?

A

how long it takes a wave to go through it’s full motion

49
Q

Why do objects appear different underwater?

A

Because when the light rays hitting the object leave the water they are entering a less dense medium (air) and bend further away from the normal then hitting our eye and our brain perceives the light to have travelled in a straight line

science revision (10 decks)

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