Light Science 8

Question 1

image

Answer 1

a representation of the external form of a person or thing in art.

Question 2

light

Answer 2

the natural agent that stimulates sight and makes things visible

Question 3

natural light source

Answer 3

Natural sources of light include the sun, stars, fire, and electricity in storms.

Question 4

radiates

Answer 4

emit (energy, especially light or heat) in the form of rays or waves.

Question 5

radiation

Answer 5

the transfer of energy in the form of electromagnetic

waves

Question 6

radiant energy

Answer 6

radiant energy, the energy that is transferred by electromagnetic radiation, such as light, X-rays, gamma rays, and thermal radiation

Question 7

artificial light source

Answer 7

Details on the development of artificial light, including the incandescent bulb, fluorescent lighting and LED lighting

Question 8

incandescent source

Answer 8

The incandescent light bulb or lamp is a source of electric light that works by incandescence

Question 9

incandescence

Answer 9

État d’un corps incandescent.

Question 10

fluorescence

Answer 10

Fluorescence is the ability of certain chemicals to give off visible light after absorbing radiation which is not normally visible, such as ultraviolet light.

Question 11

phosphorescence

Answer 11

Phosphorescence is a type of photoluminescence related to fluorescence. When exposed to light (radiation) of a shorter wavelength, a phosphorescent substance will glow

Question 12

chemiluminescence

Answer 12

Chemiluminescence (CL) is defined as the production of electromagnetic radiation (ultraviolet, visible or infrared)

Question 13

bioluminescence

Answer 13

Bioluminescence is the production and emission of light by a living organism. Bioluminescent creatures are found throughout marine habitats

Question 14

ray

Answer 14

each of the lines in which light (and heat) may seem to stream from the sun or any luminous body, or pass through a small opening.

Question 15

ray diagram

Answer 15

A ray diagram is a representation of the possible paths light can take to get from one place to another. This is often from a source or object to an observer or screen.

Question 16

transparent

Answer 16

(of a material or article) allowing light to pass through so that objects behind can be distinctly seen.

Question 17

translucent

Answer 17

(of a substance) allowing light, but not detailed shapes, to pass through; semitransparent.

Question 18

opaque

Answer 18

not able to be seen through; not transparent.

Question 19

luminous

Answer 19

full of or shedding light; bright or shining, especially in the dark.

Question 20

non-luminous

Answer 20

: not emitting light : not luminous The results also suggest this galaxy contains a substantial amount of nonluminous matter.

Question 21

reflection

Answer 21

the throwing back by a body or surface of light, heat, or sound without absorbing it.

Question 22

incident ray

Answer 22

An incident ray is a ray of light that strikes a surface. The angle between this ray and the perpendicular or normal to the surface is the angle of incidence.

Question 23

reflected ray

Answer 23

Reflected ray. A ray of light or other form of radiant energy which is thrown back from a nonpermeable or nonabsorbing surface; the ray which strikes the surface before reflection is the incident ray.

Question 24

Normal line

Answer 24

The normal line is defined as the line that is perpendicular to the tangent line at the point of tangency.

Question 25

angle of incidence

Answer 25

In geometric optics, the angle of incidence is the angle between a ray incident on a surface and the line perpendicular to the surface at the point of incidence, called the normal.

Question 26

angle of reflection

Answer 26

: the angle between a reflected ray and the normal drawn at the point of incidence to a reflecting surface.

Question 27

plane mirror

Answer 27

A plane mirror is a mirror with a flat reflective surface. For light rays striking a plane mirror, the angle of reflection equals the angle of incidence.

Question 28

law of reflection

Answer 28

The normal line divides the angle between the incident ray and the reflected ray into two equal angles.

Question 29

plane

Answer 29

An airplane or aeroplane is a fixed-wing aircraft that is propelled forward by thrust from a jet engine, propeller, or rocket engine.

Question 30

refraction

Answer 30

In physics, refraction is the change in direction of a wave passing from one medium to another or from a gradual change in the medium.

Question 31

angle of refraction

Answer 31

According to Snell’s law, the angle of refraction, θr, depends on the angle of incidence, θi, and the ratio of the refractive indices of the two media that make up the interface.