light

Question 1

absorb

Answer 1

Taken into a material.

Question 2

angle of incidence

Answer 2

The angle between the incident ray and the normal line.

Question 3

angle of reflection

Answer 3

The angle between the reflected ray and the normal line.

Question 4

brain

Answer 4

The organ in the human body that processes signals from receptors.

Question 5

charge-coupled device (CCD)

Answer 5

A grid of pixels at the back of a digital camera that absorbs light and produces an image.

Question 6

continuous

Answer 6

A variable that has values that can be any number.

Question 7

converging

Answer 7

Bringing rays of light together.

Question 8

convex

Answer 8

A lens that produces converging rays of light.

Question 9

cornea

Answer 9

The transparent layer at the front of the eye.

Question 10

diffuse reflection

Answer 10

Reflection from a rough surface.

Question 11

dispersion

Answer 11

The splitting up of a ray of light of mixed wavelengths by refraction into its components.

Question 12

emit

Answer 12

To give out.

Question 13

endoscope

Answer 13

A medical instrument for seeing inside the human body.

Question 14

eye

Answer 14

Organ of sight, which focuses and detects light.

Question 15

filter

Answer 15

A piece of material that allows some radiation (colours) through but absorbs the rest.

Question 16

focal point

Answer 16

The point at which the rays refracted by a convex lens cross over.

Question 17

focus

Answer 17

Another name for the focal point.

Question 18

frequency

Answer 18

The number of complete waves or vibrations produced in one second (measured in hertz).

Question 19

image

Answer 19

The point from which rays of light entering the eye appear to have originated.

Question 20

incident ray

Answer 20

The ray coming from a source of light.

Question 21

inverted

Answer 21

Upside down.

Question 22

iris

Answer 22

The coloured part of your eye

Question 23

law of reflection

Answer 23

The angle of incidence is equal to the angle of reflection.

Question 24

lens

Answer 24

A device made of shaped glass that focuses light rays from objects to form an image.

Question 25

light-time

Answer 25

Distance measured in terms of how far light travels in a given time.

Question 26

luminous

Answer 26

Gives out light.

Question 27

medium

Answer 27

The material that affects light or sound by slowing it down or transferring the wave.

Question 28

non-luminous

Answer 28

Objects that produce no light.

Question 29

normal

Answer 29

An imaginary line at right angles to a surface where a light ray strikes it.

Question 30

opaque

Answer 30

Objects that absorb, scatter, or reflect light and do not allow any light to pass through.

Question 31

optic nerve

Answer 31

A paired sensory nerve that runs from each eye to the brain.,

Question 32

photoreceptors

Answer 32

Specialised cells that are sensitive to light.

Question 33

pinhole camera

Answer 33

A simple camera made of a box with a small hole at the front and a screen at the back.

Question 34

pixel

Answer 34

A picture element found at the back of a digital camera.

Question 35

plane

Answer 35

A mirror with a flat, reflective surface.

Question 36

primary colour

Answer 36

The colours red, blue, and green.

Question 37

prism

Answer 37

A triangular-shaped piece of glass used to produce a spectrum of light.

Question 38

pupil

Answer 38

The hole in the front of your eye where light goes in.

Question 39

real (image)

Answer 39

An image that you can put on a screen; the image formed in your eyes.

Question 40

reflect

Answer 40

Bounce off.

Question 41

reflected ray

Answer 41

The ray that is reflected from a surface.

Question 42

refraction

Answer 42

The change in direction of a ray or wave as a result of its change in speed.

Question 43

retina

Answer 43

The layer of light sensitive cells at the back of the eye.

Question 44

secondary colour

Answer 44

Colours that can be obtained by mixing two primary colours.

Question 45

source

Answer 45

Things that emit (give out) light or sound.

Question 46

spectrum

Answer 46

A band of colours produced when light is spread out by a prism.

Question 47

specular reflection

Answer 47

Reflection from a smooth surface.

Question 48

translucent

Answer 48

Objects that transmit light but diffusing (scattering) the light as it passes through.

Question 49

transmit

Answer 49

When light or other radiation passes through an object.

Question 50

transparent

Answer 50

Objects that transmit light and you can see through them.

Question 51

vacuum

Answer 51

A space in which there is no matter.

Question 52

virtual

Answer 52

An image that cannot be focused onto a screen.

Question 53

wave

Answer 53

A vibration that transfers energy.