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Physical Science > C15 Terms > Flashcards

C15 Terms Flashcards

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1
Q

continuous spectrum

A

All wave lengthens

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2
Q

line spectrum

A

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

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3
Q

spectrograph

A

A photograph of a spectrum

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4
Q

light-year (ly)

A

The distance light travels In one year.

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5
Q

intensity

A

The rate at which a source radiates energy

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6
Q

candela (cd)

A

The SI unit of light

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7
Q

inverse-square law

A

Encountered many times in physics

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8
Q

incandescence

A

Light produced by matter heated till growing

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9
Q

fluorescence

A

When a substance radiates visible light from another frequency

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10
Q

phosphorescence

A

Continues to emit light after it stops absorbing energy

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11
Q

coherent light

A

Produces monochromatic light

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12
Q

cold light

A

Produced by chemical reactions

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13
Q

primary hue

A

Red blue and green

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14
Q

additive primary color

A

Red blue and green

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15
Q

subtractive primary color

A

Produce more brilliant colors

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16
Q

complementary color

A

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

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17
Q

saturation

A

The brightness of a color

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18
Q

value

A

How dark or light the color is

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19
Q

color system

A

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

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20
Q

beam

A

Made up of lots of photons moving in the same direction

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21
Q

ray

A

The path a light photon takes

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22
Q

diffuse reflection

A

Light beams are sent I all directions

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23
Q

specular reflection

A

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

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24
Q

incident ray

A

The light ray approaching a reflective surface

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25
Q

reflected ray

A

The ray leaving the reflective surface

26
Q

law of reflection

A

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

27
Q

plane mirror

A

A flat mirror

28
Q

virtual image

A

The image seen from a plane or convex mirror

29
Q

real image

A

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

30
Q

concave mirror

A

Is slightly dished in on the reflective side

31
Q

principal optical axis

A

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

32
Q

principal focus

A

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

33
Q

focal point

A

Or the principal focus

34
Q

focal length

A

The distance the principle focus is from the mirror

35
Q

convex mirror

A

The surface is bulged outward

36
Q

optical density

A

The speed of light changes related to this

37
Q

index of refraction (n)

A

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

38
Q

total internal reflection

A

How light bends when changing materials

39
Q

critical angle of incidence

A

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

40
Q

fiber optics

A

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

41
Q

light dispersion

A

How a rain bow is formed

42
Q

lens

A

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

43
Q

converging lens

A

Collects the incoming rays like a concave mirror

44
Q

diverging lens

A

Spreads the rays of light apart similar to a convex mirror

45
Q

meniscus lens

A

The lenses in eyeglasses

46
Q

charge-coupled device (CCD)

A

A digital camera sensor

47
Q

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

A

It is different for each person.

48
Q

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

A

By defining there wavelengths.

49
Q

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

A

Luminous and illuminated. Luminous

50
Q

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

A

Lights speed can vary

51
Q

What is the SI unit for light intensity?

A

The candela

52
Q

Why are the additive primary colors for human vision?

A

Red blue and green

53
Q

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

A

The difference be tween colors

54
Q

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

A

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

55
Q

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

A

How much the mirror is dipped in

56
Q

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

A

A strait one

57
Q

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

A

The light waves travel at different speeds thew different materials

57
Q

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

A

They will be the same size

57
Q

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?

A

Twice.. They spread apart

57
Q

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

A

On the opposite side

57
Q

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

A

A virtual one

58
Q

What do all optical instruments and devices have in common?

A

A lens

Physical Science (20 decks)

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