Light Review
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
