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49 Cards in this Set

  • Front
  • Back

The material a wave travel through

a medium

Can travel without a medium; can travel through an empty space

light

You need ______ to make a wave

energy

Repeated back-and-forth or up-and-down


motion caused by energy to the medium

Vibration

4 basic properties of waves

amplitude, wavelength, frequency, speed

Maximum distance between the resting position and crest (top of the wave)

Crest

Number of complete waves that pass in a certain time

Frequency

The unit of the frequency of a wave is measured

hertz

------ transfers electrical and magnetic energy that vibrate at right angles

An electronicmagnetic wave

The energy that is transferred through space by electromagnetic waves

electromagnetic radiation

The electromagnetic spectrum is made up of...

radio waves, infrared waves, visible light, ultraviolet rays, X rays and gamma rays

Electromagnetic waves that you can see

visible light

How does visible light interact with an object?

The light can be reflected, transmitted or absorbed

A _______ material transmits most of the light that strikes it

transparent

A _______ material scatters light as it passes through. you can see the object but blurred

translucent

An _______ material reflects or absorb all of the lights that strikes it. You can't see through.

opaque

3 colors that can combine to make any other color

primary colors (red,green and blue)

2 primary colors combined in equal amounts to produce a _______ color

secondary

Any 2 colors that combine to form white light

complementary colors

the law of reflection

states that the angle of incidence equals the angle of reflection

How is mixing pigments different from mixing colors of light?

The ore pigments are added together, fewer colors of lights are reflected and more are absorbed

a flat sheet of glass that has a smooth, silver-colored coating on one side.

a plane mirror

A mirror with a surface that curves inward like the inside of a bowl

a concave mirror

An imaginary line that divides a mirror in half

optical axis

The point at which rays parallel to the optical axis meet or converge

focal point

A mirror with a surface that curves outward

a convex mirror

When light rays enter a medium at an angle, the change in speed cassette rays to bend, or change direction

Refraction

A curved piece of glass or other transparent material that refracts light

a lens

A lens that is thicker in the center than at the edges (= magnifying glass)

a convex lens

A lens that is thinner in the center than at the edges

a concave lens

Which type of lens can only produce virtual images because the parallel light rays passing through the lens never meet?

Concave lens

What causes light rays to bend when they enter a new medium at an angle?

change of speed

How do you see objects?

The light from an object enters the eye, your eye sends the single to your brain and you see the object

The transparent front surface of the eye. It protects the eye and acts as a lens to help focus light rays

cornea

An opening through which light enters the inside of the eye

pupil

A ring of muscle that contracts and expands to change the size of the pupil

Iris

A layer of cells that lines the inside of the eyeball

Retina

Tiny light sensitive cells in the retina that responds to light and color

Rods and Cones

Where does the image form in the eye

Retina

______ lenses are used to correct nearsightedness

concave

______ lenses are used to correct farsightedness

convex

A _____ person can see nearby things more clearly but object far are blurred

nearsighted

A _____ person can see the things far clearly but objects near are blurred

farsighted

How is an image formed on the retina?

The light enters the pupil and the lens. The lens bends light to form an upside down image on the retina.

What part of a camera controls the amount of light that enters the camera?

"Lens" focus the light to form the image

The larger lens that gathers the light coming fro an object and focuses the rays to form a real image in a refracting telescope

the objective lens

A reflecting telescope uses a _____ mirror to gather light

concave

What is the difference between refracting telescope and a reflecting telescope?

Refracting Telescopes use a large objective lens as their primary light-collecting element. Reflecting Telescopes use a concave primary mirror to collect light and form an image.

The color of an opaque object is the color of the _____ it reflects

light