Light Review

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what's an easy way to create an interference pattern

toss 2 pebbles into water close to each other

What is a material through which light can pass but will be scattered in different directions?

translucent

When light is transmitted a substance is said to be ______

transparent

what type of material is a lens?

transparent

Type of light wave from the electromagnetic spectrum that can be seen by human eyes; is made up of the colors of the rainbow--red, orange, yellow, green, blue, indigo, violet; necessary for photosynthesis in plants and vision in humans

visible

The colors that make up white light are called what?

visible spectrum

What color does adding blue, red and green?

white

when light changes speed from entering one medium to another what happens to it

it bends (refraction)

what happens to light when it enters a prism

it refracts (bends) into all the colors

What is white light

it's not a single color but made of 7 colors of the rainbow

We "see" objects because ____waves are reflected off of them or emitted (given off) by them.

light

What is reflection

light rays strike a mirror and bounce off

Different colors have different

masses

What does transparent mean?

material through which light can pass.

Which of the following would reflect the most light?

mirror is smooth, shiny surface

Light particles is called a _____

photon

shows image upright and life sized

plane mirror

Transparent polygonal solid object with flat faces and a usually triangular cross section, used for separating white light into a spectrum of colors

prism

Which tool can be used to separate white light into different colors?

prism

refract light to produce rainbows

prisms

Red glass absorbs all colors of light except what?

red

What are the primary colors

red blue green

carries the least energy of all visible light

red wavelengths

What colors would purple pants reflect?

red, and blue since they make up purple

We see things because the ______ light into our eyes

reflect

What do mirrors do

reflect light

The change in direction of a wavefront at an interface between two different media so that the wavefront returns into the medium from which it originated; common examples of this appear in light, sound and water waves. Just look in a mirror to observe this.

reflection

wave bounces back after striking a barrier

reflection

The color of an object depends on the color of light it ______

reflects

To throw or bend back (light, for example) from a surface

refract

What does a lens do?

refract light

The change in direction of a wave due to a change in its speed; it's most commonly observed when a wave passes from one medium to another at an angle ( for example, a straw in a glass of water appears to be broken, due to this)

refraction

what is the difference between refraction and diffraction

refraction involves bending of light diffraction involves bending and spreading of light usually around an obstacle

If the surface is rough, the light ______.

scatters

Light speeds up or slows down when leaving air and entering a liquid

slows down

The main thing about refraction is that light ____ when it enters a medium that is more dense than the one it is leaving.

slows down

When light leaves a solid and enters a liquid it ____

speeds up

light ___ when it enters a medium that is less dense than the one it left.

speeds up

How are rainbows formed

sunlight is split up by raindrops

Change in the directions and intensities of a group of waves after passing by an obstacle or through an aperture whose size is approximately the same as the wavelength of the waves.

diffraction

what is this an example of? voice echoing back when you shout into a canyon

diffraction

When light hits a surface what can happen?

Be transmitted, absorbed or reflected

What is a red book red?

It reflects only red light

does light need a medium to travel through? Yes/No

No

How to remember colors of white light or of the rainbow

ROYGBIV red orange yellow green blue indigo violet

Light, microwaves, x-rays, and radio waves are all examples of this kind of waves

electromagnetic

these waves are made of vibrating electric and magnetic field

electromagnetic

The color that is transmitted is the color that reaches your eye. T/F

T

A colored glass or other transparent material used to select the wavelengths of light allowed to reach a photosensitive material

filter

what is a plane mirror

flat surface reflection is upright and same size as you image in mirrors are reversed from left to right

the smaller the wavelength the higher the _________

frequency

a beam of light bends when it passes from air into water, and then bends even more when it passes from water into glass, what does this mean?

glass is denser than water

The law of reflection involves two light rays. What are they?

incoming and outgoing. Angles of both are equal

The variation of wave amplitude that occurs when waves of the same or different frequency come together

interference

why does white light from sun form a rainbow when it passes through water in air

colors that make up white light refract at different angles

thinner in the middle than the edges; curved inward

concave mirrors

thicker in the middle than the edges

convex mirrors

What is light?

a form of energy that travels in waves

What colors would a white hat reflect?

all 7 colors

blue light bends more than red light when it passes through glass. Blue light has a greater?

angle of refraction

what type of stuff can be refracted

anything that travels in waves

What is the Doppler effect in light?

as stars move away from Earth, there is a shift in the light towards the red end of the spectrum.

What do light rays do as they pass from one transparent material to another?

bend

What do filters do to light?

block out the colors

If the surface is smooth and flat, the light will ____ off it at equal angles.

bounce

Reflection happens when light strikes and then __________________ a surface.

bounces off

light refracts when

changes speed


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