C15 Terms

Question 1

continuous spectrum

Answer 1

All wave lengthens

Question 2

line spectrum

Answer 2

Distinctly visible lines of color aligned along a scale in a spectrograph

Question 3

spectrograph

Answer 3

A photograph of a spectrum

Question 4

light-year (ly)

Answer 4

The distance light travels In one year.

Question 5

intensity

Answer 5

The rate at which a source radiates energy

Question 6

candela (cd)

Answer 6

The SI unit of light

Question 7

inverse-square law

Answer 7

Encountered many times in physics

Question 8

incandescence

Answer 8

Light produced by matter heated till growing

Question 9

fluorescence

Answer 9

When a substance radiates visible light from another frequency

Question 10

phosphorescence

Answer 10

Continues to emit light after it stops absorbing energy

Question 11

coherent light

Answer 11

Produces monochromatic light

Question 12

cold light

Answer 12

Produced by chemical reactions

Question 13

primary hue

Answer 13

Red blue and green

Question 14

additive primary color

Answer 14

Red blue and green

Question 15

subtractive primary color

Answer 15

Produce more brilliant colors

Question 16

complementary color

Answer 16

A color produced by the mixing of any pair of additive or subtractive primary colors

Question 17

saturation

Answer 17

The brightness of a color

Question 18

value

Answer 18

How dark or light the color is

Question 19

color system

Answer 19

Identified by the primary colors mixed together to produce the colors in the system

Question 20

beam

Answer 20

Made up of lots of photons moving in the same direction

Question 21

ray

Answer 21

The path a light photon takes

Question 22

diffuse reflection

Answer 22

Light beams are sent I all directions

Question 23

specular reflection

Answer 23

When a surface is so smooth and uniform that it reflects rays in a uniform way

Question 24

incident ray

Answer 24

The light ray approaching a reflective surface

Question 25

reflected ray

Answer 25

The ray leaving the reflective surface

Question 26

law of reflection

Answer 26

The ray leaving the reflector is at the same angle as the ray hitting the reflector but in the opposite direction

Question 27

plane mirror

Answer 27

A flat mirror

Question 28

virtual image

Answer 28

The image seen from a plane or convex mirror

Question 29

real image

Answer 29

Is form when the rays of light from a source are made to converge or come together by a focusing optical device

Question 30

concave mirror

Answer 30

Is slightly dished in on the reflective side

Question 31

principal optical axis

Answer 31

An imaginary line normal to the mirrors surface in the middle of the mirror

Question 32

principal focus

Answer 32

The point at which the rays converge on a point in front of a concave mirror

Question 33

focal point

Answer 33

Or the principal focus

Question 34

focal length

Answer 34

The distance the principle focus is from the mirror

Question 35

convex mirror

Answer 35

The surface is bulged outward

Question 36

optical density

Answer 36

The speed of light changes related to this

Question 37

index of refraction (n)

Answer 37

The ratio of the speed of light in a vacuum to the speed of light in the material

Question 38

total internal reflection

Answer 38

How light bends when changing materials

Question 39

critical angle of incidence

Answer 39

The reflected light ray is parallel to the boundary surface between the media

Question 40

fiber optics

Answer 40

Technology using bundles of long fine transparent glass fibers that transmit light along their lengths by total internal reflection

Question 41

light dispersion

Answer 41

How a rain bow is formed

Question 42

lens

Answer 42

A disk of optically clear material that refracts light to produce a real or virtual image

Question 43

converging lens

Answer 43

Collects the incoming rays like a concave mirror

Question 44

diverging lens

Answer 44

Spreads the rays of light apart similar to a convex mirror

Question 45

meniscus lens

Answer 45

The lenses in eyeglasses

Question 46

charge-coupled device (CCD)

Answer 46

A digital camera sensor

Question 47

Why is it impossible to define the limits of the visible light spectrum?

Answer 47

It is different for each person.

Question 48

How do physicists identify a particular color to avoid confusing it with other similar colors?

Answer 48

By defining there wavelengths.

Question 49

What two terms describe objects from which light is provided? Which kind produces it's own light?

Answer 49

Luminous and illuminated. Luminous

Question 50

Why does the speed of lights value have an uncertainty of zero?

Answer 50

Lights speed can vary

Question 51

What is the SI unit for light intensity?

Answer 51

The candela

Question 52

Why are the additive primary colors for human vision?

Answer 52

Red blue and green

Question 53

What is a color space when referring to a color system?

Answer 53

The difference be tween colors

Question 54

Since a mixture of all subtractive primary colors cannot produce black how do computer printers produce black in color images and in text?

Answer 54

When they are all mixed all the light is absorbed and it looks black

Question 55

What defines the location of the principal focus In a concave mirror?

Answer 55

How much the mirror is dipped in

Question 56

When light photons are considered to be partials what kind of path do they usually travel?

Answer 56

A strait one

Question 57

How is a materials index of refraction related to its optical density.

Answer 57

The light waves travel at different speeds thew different materials

Question 57

Will the rays angle of refraction be larger or smaller than its angle of incidence?

Answer 57

They will be the same size

Question 57

How many times is a beam of light refracted when it passes through a triangular prism? What happens to the color in the beam each time it is refracted?

Answer 57

Twice.. They spread apart

Question 57

Where is the real image formed by a lens in relation to its object?

Answer 57

On the opposite side

Question 57

When a lens is used as a magnifying glass is the image seen by the lens a real or virtual image?

Answer 57

A virtual one

Question 58

What do all optical instruments and devices have in common?

Answer 58

A lens