Light

Question 1

Light is a form of…

Answer 1

energy

Question 2

Light travels in…

Answer 2

waves

Question 3

Light doesn’t need …? to move

Answer 3

matter

Question 4

What is the speed of light?

Answer 4

about 300,000 km/s

Question 5

The height of the light waves is the…

Answer 5

amplitude

Question 6

The top of the light wave is called the…

Answer 6

crest

Question 7

The bottom of the light wave is called the…

Answer 7

trough

Question 8

The wavelength distance is…

Answer 8

crest to crest, or trough to trough

Question 9

Short wavelengths have a…

Answer 9

high frequency

Question 10

Long wavelengths have a…

Answer 10

low frequency

Question 11

The 7 types of EMS radiation

Answer 11

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

Question 12

Luminous objects…

Answer 12

produce light

Question 13

Non-luminous objects…

Answer 13

reflect light

Question 14

Transmitted light…

Answer 14

passes through transparent objects

Question 15

Reflected light…

Answer 15

bounces off objects

Question 16

Objects that absorb light…

Answer 16

take the energy and convert it to heat energy

Question 17

White light is formed by…

Answer 17

all the colours being combined/reflected off an object

Question 18

Objects appear black when…

Answer 18

they absorb all the colours of the spectrum

Question 19

Objects appear certain colours when they…

Answer 19

reflect that colour and absorb all the others

Question 20

Regular Reflection

Answer 20

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

Question 21

Diffuse Reflection

Answer 21

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

Question 22

Lateral inversion…

Answer 22

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

Question 23

The Law of Reflection

Answer 23

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

Question 24

Refraction is…

Answer 24

the bending of light

Question 25

Medium

Answer 25

is a substance through which light travel can travel

Question 26

Plural of medium

Answer 26

media

Question 27

Refraction Index

Answer 27

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

Question 27

MTLA

Answer 27

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.

Question 28

Lenses

Answer 28

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

Question 29

Real image

Answer 29

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

Question 30

Virtual image

Answer 30

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.

Question 31

Convex Lenses

Answer 31

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

Question 32

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

Answer 32

a real image bc they converge at a visible focal point

Question 33

Concave Lenses

Answer 33

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

Question 34

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

Answer 34

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

Question 35

Cornea

Answer 35

Clear window, refracts light, helps to focus the light

Question 36

Pupil

Answer 36

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

Question 37

Iris

Answer 37

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

Question 38

Lens

Answer 38

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

Question 39

Retina

Answer 39

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

Question 40

Optical nerve

Answer 40

Takes messages from the retina to the brain

Question 41

Sclera

Answer 41

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

Question 42

Liquid humour

Answer 42

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.

Question 43

More light is let in when the pupil is...

Answer 43

dilated

Question 44

Less light is let in when the pupil is...

Answer 44

constricted

Question 45

Rods and cones are types of...

Answer 45

photoreceptors

Question 46

Order the visible colours longest to shortest wavelength

Answer 46

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

Question 47

What is frequency?

Answer 47

how many waves per second

Question 48

What is the period of a wave?

Answer 48

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

Question 49

Why do objects appear different underwater?

Answer 49

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