Light

Question 0

transparent

Answer 0

objects transmit all or almost all incident light

Question 1

geometric optics

Answer 1

the use of light rays to determine the path of light when it strikes an object; light can be reflected, transmitted, or absorbed, depending on the object

Question 2

translucent

Answer 2

objects transmit some incident light, and either absorb or reflect the rest

Question 3

opaque

Answer 3

when material does not transmit any incident light; all incident light is either absorbed or reflected; objects behind the material cannot be seen at all

Question 4

medium

Answer 4

any physical substance through which energy can be transferred

Question 5

radiation

Answer 5

a method of energy transfer that does not require a medium; the energy travels at the speed of light

Question 6

electromagnetic wave

Answer 6

a wave that has both electric and magnetic parts, does not require a medium, and travels at the speed of light

Question 7

visible light

Answer 7

electromagnetic waves that the human eye can detect

Question 8

electromagnetic spectrum

Answer 8

the classification of electromagnetic waves by energy

Question 9

visible spectrum

Answer 9

the continuous sequence of colours that make up white light

Question 10

luminous

Answer 10

produces its own light

Question 11

non-luminous

Answer 11

does not produce its own light

Question 12

incandescence

Answer 12

the production of light as a result of high temperature

Question 13

electric discharge

Answer 13

the process of producing light by passing an electric current through a gas

Question 14

phosphorescence

Answer 14

process of producing light by the absorption of ultraviolet light resulting in the emission of visible light over an extended period of time
(glow in the dark stickers)

Question 15

fluorescence

Answer 15

the immediate emission of visible light as a result of the absorption of ultraviolet light

Question 16

chemiluminescence

Answer 16

the direct production of light as a result of a chemical reaction with little or no heat produced

Question 17

bioluminescence

Answer 17

production of light in living organisms as the result of a chemical reaction with little or no heat produced

Question 18

triboluminescence

Answer 18

the production of light from friction as a result of scratching, crushing, or rubbing certain crystals

Question 19

light-emitting diode (LED)

Answer 19

light produced as a result of an electric current flowing in semiconductors

Question 20

semiconductors

Answer 20

a material that allows an electric current to flow in only one direction

Question 21

light ray

Answer 21

line on a diagram representing the direction and path that light is travelling

Question 22

image

Answer 22

reproduction of an object through the use of light

Question 23

mirror

Answer 23

any polished surface reflecting an image

Question 24

reflection

Answer 24

the bouncing back of light from a surface

Question 25

plane

Answer 25

flat

Question 26

incident ray

Answer 26

the incoming ray that strikes a surface

Question 27

reflected ray

Answer 27

the ray that bounces off a reflective surface

Question 29

perpendicular

Answer 29

at right angles

Question 30

angle of incidence

Answer 30

the angle between the incident ray and the normal

Question 31

angle of reflection

Answer 31

the angle between the reflected ray and the normal

Question 32

laws of reflection

Answer 32

1. the angle of incidence equals the angle of reflection | 2. the incident ray, the reflected ray, and the normal all lie in the same plane

Question 33

specular reflection

Answer 33

reflection of light off a smooth surface

Question 34

diffuse reflection

Answer 34

reflection of light off an irregular or dull surface

Question 35

virtual image

Answer 35

an image formed by light coming from an apparent light source; light is not arriving at or coming from the actual image location

Question 36

SALT

Answer 36

size, attitude, location, type

Question 43

normal

Answer 43

the perpendicular line to a mirror surface