Think Literacy - Science Grade 8

Front 1

additive

Back 1

- the process of adding colours of light together to produce new colours

Front 2

concave

Back 2

- a mirror or lens that curves inward near the centre

Front 3

convex

Back 3

- a mirror or lens that curves outward near the centre

Front 4

diffuse

Back 4

- when light reflects off an irregularly shaped surface resulting in light going in many different directions

Front 5

electromagnetic
radiation

Back 5

- all types of radiation produced by moving electric charges, such as light, infared, ultraviolet, X-rays, microwaves, and radio waves

Front 6

focus

Back 6

- the name of the spot where parallel rays of light are brought together to a common point by a lens or a mirror

Front 7

incident

Back 7

- light that falls on an object

Front 8

lens

Back 8

- a transparent optical device with curved sides that is used to bring light rays together, or to spread them apart

Front 9

luminous

Back 9

- a body that produces its own light (ie. a burning match is luminous)

Front 10

non-luminous

Back 10

- a body that can only be seen by reflected light; it does not produce its own light (ie. a textbook is non-luminous)

Front 11

opaque

Back 11

- a material that does not transmit any incident light; all of the light falling on this material is either absorbed and/or reflected

Front 12

plane

Back 12

- a flat surface

Front 13

ray

Back 13

- a pencil-thin beam of light

Front 14

real image

Back 14

- an image in which light is actually arriving at the image location

Front 15

refraction

Back 15

- the bending of light as it passes from one material to another

Front 16

regular

Back 16

- when light reflects off a flat surface resulting in the reflected light all going in the same direction

Front 17

subtractive

Back 17

- the process of absorbing or taking away colours from light in order to produce new colours

Front 18

translucent

Back 18

- a material that transmits some incident light; the remaining light falling on this material is either absorbed and/or reflected

Front 19

transparent

Back 19

- a material that transmits all light falling on it

Front 20

virtual image

Back 20

- an image in which light is not actually arriving at the image location

Front 21

visible spectrum

Back 21

- the range of colours that are visible to the human eye (ie. ROY G BIV ~ red, orange, yellow, green, blue, indigo, violet)

Front 22

watts

Back 22

- a unit of power
more power = more intensity
= Joule/second
W = J/second

Front 23

joule (J)

Back 23

- a unit used to measure energy or work

Front 24

normal

Back 24

- the line that is at right andles (ie. 90°) to a surface

Front 25

light

Back 25

- the form of energy we can see

Front 26

natural light source

Back 26

- a non-human-made source of light, such as the sun

Front 27

radiate

Back 27

- to send out energy in the form of waves or rays

Front 28

radiation

Back 28

- the transfer of radiant energy, such as light

Front 29

radiant energy

Back 29

- energy transferred or emitted as waves or rays in all directions

Front 30

artificial light source

Back 30

- a human-made source of light

Front 31

intensity

Back 31

- brightness (of light); describes how much energy a surface will receive

Front 32

incandescent source

Back 32

- an object that can be heated to such a high temperature that it emits visible light

Front 33

incandescence

Back 33

- the emission of visible light by a hot object

Front 34

flourscent source

Back 34

- a source that produces light when exposed to light of a particular wavelength

Front 35

phosphorescent source

Back 35

- a substance that gives off visible light released after the energy has been absorbed by certain particles that have stored this energy for a while. The light continues for some time even after it is no longer exposed to light.

Front 36

phosphorescence

Back 36

- the persistent emission of light following exposure to and removal of a source of radiation

Front 37

chemiluminescence

Back 37

- the emission of light resulting from chemical action and not involving heat

Front 38

chemiluminescence source

Back 38

- chemical reaction that produces particles that gives off visible light energy

Front 39

bioluminescence

Back 39

- the emission of light produced by chemical reactions inside the bodies of living creatures

Front 40

bioluminescent source

Back 40

- an organism that relies on chemical reactions inside its body to produce light (ie. a firefly)

Front 41

kilowatt hour

Back 41

- a unit of electrical energy; the amount of energy transmitted by one thousand watts of power over a period of one hour; 1 kW h of power used for 1 h

Front 42

ray diagram

Back 42

- a representation of the path of light by using a straight line with an arrow

Front 43

transparent

Back 43

- allowing light to pass through

Front 44

translucent

Back 44

- allowing some light to pass through. The light, however, is scattered from its straight path.

Front 45

opaque

Back 45

- not allowing any light to pass through