Light!!!!!!!!!!!

Front 1

What do transparent materials do to light?

Back 1

transmit light that strikes it

Front 2

What do translucent materials do to light?

Back 2

scatter light as it passes through

Front 3

What do opaque objects do to light?

Back 3

reflects and absorbs light that strikes it

Front 4

What determines the color of an opaque object

Back 4

The color of an opaque object is the color of light it reflects.

Front 5

What determines the color of a transparent or translucent object?

Back 5

The color of light it transmits

Front 6

secondary color

Back 6

2 primary colors combind

Front 7

primary colors

Back 7

red, blue, green

Front 8

complementary colors

Back 8

2 colors that combine to form white light

Front 9

pigments

Back 9

absorb some colors and reflect others they are found in dyes, inks, and paints

Front 10

rays

Back 10

waves in straight lines

Front 11

concave mirror

Back 11

mirror that's surface cures inward

Front 12

optical axis

Back 12

imaginary line that divides a mirror in half

Front 13

focal point

Back 13

a point at which rays parallel to the optical axis meet

Front 14

real image

Back 14

when the rays meet

Front 15

convex mirror

Back 15

a mirror with a surface that curves outward

Front 16

why are images formed by a convex mirror always smaller?

Back 16

because they rays never meet

Front 17

lens

Back 17

a curved piece of glass or other transparent material that is used to refract light

Front 18

convex lens

Back 18

is thicker in the center than at the edges

Front 19

concave lens

Back 19

is thicker and the edges

Front 20

electromagnetic wave

Back 20

a transverse wave that transfers electrical and magnetic energy

Front 21

What does an electromagnetic wave consist of?

Back 21

vibrating electric and magnetic fields that move through space at the speed of light

Front 22

electromagnetic radiation

Back 22

the energy that is transfered through space by electromagnetic waves

Front 23

what is the speed of life in a vacuum?

Back 23

300,000 kilometers per second

Front 24

polarized light

Back 24

the light that passes through vibrates in only one direction.

Front 25

photoelectric effect

Back 25

When a beam of light shines on some substances, the electrons move. sometimes the electron can even be knocked out of the substance because its moving so much.

Front 26

photon

Back 26

a packet of light energy

Front 27

what is similar and different about the waves on the electromagnetic spectrum?

Back 27

The all travel at the same speed in a vacuum, but have DIFFERENT wavelengths and frequency's.

Front 28

electromagnetic spectrum

Back 28

the complete range of electromagnetic waves placed in order of increasing frequency.

Front 29

radio waves

Back 29

The electromagnetic waves with the longest wavelengths and lowest frequencies ( ex. Radio, televison)

Front 30

microwaves

Back 30

The radio waves with the shortest wavelengths and the highest frequency.( ex. microwaves)

Front 31

What is Radar?

Back 31

a system that uses reflected radio waves to detect objects and measure their distance and speed.

Front 32

What does Radar stand for?

Back 32

RAdio, Detection, And, Raging.

Front 33

Infrared rays

Back 33

electromagnetic waves with wavelengths shorter than those of a radio waves ( heat lamps, infrared camera's)

Front 34

thermogram

Back 34

an image that shows regions of different temperatures in different colors.

Front 35

visible light

Back 35

Electromagnetic waves that you can see.

Front 36

Ultraviolet rays

Back 36

Electromagnetic waves with wavelengths shorter then those of visible light ( ex. The sun, UV lamps ( kill bacteria on hospital equipement))

Front 37

X- rays

Back 37

electromagnetic waves with wavelengths just shorter than those of ultraviolet rays.

Front 38

What kind of matter absorbs x rays?

Back 38

lead

Front 39

gamma rays

Back 39

The electromagnetic waves with the shortest wavelengths and highest frequencies( ex. kills cancer cells)

Front 40

How are gamma rays produced?

Back 40

They are produced by explosions of stars in distant galaxies, but the earths atmostphere blocks them off.

Front 41

cornea

Back 41

The transparent surface on your eye through which light enters the eye.

Front 42

pupil

Back 42

an opening through which light enters the inside of the eye

Front 43

Iris

Back 43

a ring of muscle that contracts and expands to change the size of the pupil. The Iris gives the eye its color

Front 44

retina

Back 44

a layer of cells that lines the inside of the eyeball

Front 45

Rods

Back 45

cells that contain a pigment that responds to small amounts of light

Front 46

Cones

Back 46

cells that respond to color.

Front 47

optic nerve

Back 47

The short thick nerve that rods and cones send signals to the brain along.

Front 48

What does the pupil look like in bright light? Dim light?

Back 48

dim light- pupil is large
bright light- pupil is small

Front 49

what kind/how do lenses correct nearsightedness

Back 49

a concave lens in front of the eye spreads out light rays before they enter the eye.

Front 50

what kind/how do lenses correct farsightedness?

Back 50

a convex lens corrects this by bending light rays toward each other before they enter the eye

Front 51

What are the primary colors of pigment?

Back 51

cyan, yellow, magenta

Front 52

what are the primary colors of light?

Back 52

red, blue, green

Front 53

what are the different waves on the electromagnetic spectrum in order?

Back 53

radio waves, microwaves, infrared, visible light, Ultraviolet rays, X- rays, gamma rays.