Light Studyguide
A color filter _______ some colors of light and lets others pass through.
Absorbs
When you mix colored lights, you ___ colors until you get white.
Add
If the sun is ___________, you may see a rainbow in mist from a hose or fountain.
Behind you
In living organisms such a fireflies, chemical reactions produce _______________ at ordinary temperatures.
Bioluminescence
A material that absorbs all colors appears _____.
Black
If you look at a tomato through a green filter, the tomato will appear _____.
Black
If light passes from one substance to another, it usually _________________.
Changes Direction
Mirrors that curve in on the shiny side are called ___________.
Concave mirrors
The lens in a human eye is a(n) ______ lens.
Convex
The surfaces of a(n) ______ lens curve outward, while the surfaces of a(n) _______ lens curve inward.
Convex Concave
Mirrors that curve out on the shiny side are called __________.
Convex mirrors
In the eye, light is refracted first by the ______ and then by the _____.
Cornea Lens
The primary pigments are ____, ______, and _______.
Cyan, Yellow, and Magenta
A substance made of material that is more tightly packed together is ______ than one of material that is less tightly packed together.
Denser
Light is a form of ______.
Energy
In a(n) __________ eye, the image is focused behind the retina.
Farsighted
Most color printing uses combinations of ____ colors: the primary pigments and _____.
Four Black
In sunglasses, polarizing materials filter out _____ and other light that vibrates sideways.
Glare
Some visually impaired people are helped by specially trained __________.
Guide dogs
Some people lose their sight because of _______ or ______.
Illness or Injury
Light rays that bounce off a mirror or other shiny surface reflect a picture, or _____.
Image
Today we know that can act ___________.
In two ways.
The amount of refraction _________ as the incoming angle gets shallower.
Increases
According to the _________________, the angle between an incoming light Ray and the surface is ________ the angle between the surface and a reflected light ray.
Law of Reflection equal to
A curved piece of transparent material that refracts light to make an image is a(n) ____.
Lens
Molecules In a hot material move swiftly and collide, giving off some energy as _____.
Light
Self-tinting glasses get darker or lighter because of chemical containing particles that react to _____.
Light
Any light source converts energy of some kind into ____________.
Light energy
A beam of light that is no disturbed or bent moves in a straight line as a(n)_________.
Light ray
In a(n) ___________ eye, the lens focuses images in front of the retina.
Nearsighted
Lenses in glasses and contact lenses help correct _______________ and ______________.
Nearsightedness and Farsightedness
Light rays that reflect off _______ (rough surfaces) scatter in many directions, while those off a flat surface create a mirror image.
Objects
Blind people often read by using Braille, which is a code using _______________________.
Patterns of raised dots
A(n) _______ is a colored substance that reflects some colors and absorbs others.
Pigment
Light waves usually vibrate in all directions, but ____________ allows only light vibrating in a certain direction pass through.
Polarization
A(n) _____ is a triangular piece of clear glass that refracts white light into a band of colors.
Prism
A rainbow forms when raindrops act both as ______ to refract sunlight and as_______ to reflect the colors to your eyes.
Prisms and Mirrors
A prism refracts ___ light the least.
Red
A red cellophane filter allows _________ to pass through but absorbs ____________.
Red Light Other Colors
The primary colors of light are ___, ____, and _____.
Red, green, and blue
All objects we can see either make their own light or _____________________________________________________________.
Reflect a light from a source
The color of an object is due the the colors that it ________.
Reflects
A green leaf ________ green light and _______ red and blue light.
Reflects Absorbs
Is light enters a denser material directly, it continues in a straight path, but if it enters at an angle it is ____________________________.
Refracted in a new direction
The bending of light rays as they pass from one substance to another is called __________.
Refraction
Cells in the _______ of the human eye react to red, green, or blue light.
Retina
The lens in your eye casts an image onto a tissues called the ______, which converts it into nerve signals that go to the _____.
Retina Brain
When light passes into a denser substance is always __________.
Slows Down
Newton called the band of colors found in white light the ________.
Spectrum
White light is a mixture of the entire ________ of colors.
Spectrum
The shadows that light casts suggest that light usually travels in ______________.
Straight Lines
When you mix paints or pigments, you ________ colors until you get black.
Subtract
We cannot see the dark side of the moon because ______________________________.
That part of the moon is not being lit by the sun.
The moon shines only because it reflects _______.
The sun
A convex lens refracts lights rays ________, while a concave lens refracts light rays _____.
Together Apart
Materials that let some light through, but give a blurry view, are called ___________.
Translucent
Light easily passes through ___________ materials but is completely blocked out by ______ materials.
Transparent Opaque
The image on a flat mirror is _______ and reversed left to right, but the image in a(n) ________ mirror is upside down.
Upright Concave
A prism refracts ______ light the most.
Violet
Early scientists debated about whether light was in the form of _____ or _________.
Waves or particles
A material that reflects all colors appears _____.
White
We see a mixture of equal amounts of red, green, and blue as ___________.
White Light
If the spectrum made by a prism is passed through a second prism, the colors combine to produce ___________.
White light
