Light Studyguide

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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


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