Ch. 13 Physical Science Review

What does laser stand for

Light-Amplification by-Stimulated-Emission-Radiation

must a transparent material b colorless? explain

No, because it may be a filter and you can still se through that

list 2 advantages of using a fluorescent bulb instead of a incandescent bulb

1. it last longer 2. it uses 1/5 the amount of electricity

on what 2 things does total internal reflection rely on

1. light must travel slower in the first medium 2. must strike the boundary at an angle greater than the critical angle

what is the difference between a hologram and a photo

A hologram is a 3D image while a photo is 2D

Explain why light bends as it passes from air into glass at an angle

Glass is a more condense material than air so when the light wave goes through, the speed changes and the wave slows down causing refraction

Explain how an incandescent light bulb works.

It is generated by heating a piece of metal until it glows

what gas is commonly used in lighting devices

Phosphorus

In what type of light do waves vibrate n only one direction

Polarized light

What color has the longest wavelengths of visible light?

Red

What do we call reflection of light waves from a smooth surface?

Regular reflection

State the law of reflection.

The angle a which a light wave strikes a surface is the same as the angle at which it is reflected.

On what do optical fibers rely for their efficiency?

Total internal reflection

Explain the difference between transparent and translucent and give an example for each

Transparent- transmits all light to let you see clearly through them Ex. a clear window Translucent- transmits some light but you can not see clearly through it Ex. a light cover

Which the of lights are incandescent bulbs filled with a gas to make the filament last longer

Tungsten-Halogen lights

what color is obtained when the primary colors of light are mixed? explain

White, because light is additive

What is a photographic image of a 3-D object made without a lens?

a hologram

Why is an apple red?

because it absorbs every color except red

What color is produced by blending the 3 primary pigment colors

black

green light shines on a piece of red paper, what color is seen? Explain what happens to all the other colors

black is seen because there is no red and there is no green since they are being shined on the paper and therefore, there is no light making it black.

What color is obtained when the primary pigment colors are mixed? explain

black, because pigments are subtractive so there is no light with is black

Which type of light is produced by heat

incandescent

Eyeglasses, binoculars, and cameras take advantage of what principle

index of refraction

What are the primary pigment colors?

magenta, cyan, yellow

an image of a distant object produced by the refraction of light through air layers of different densities

mirage

most of the light is absorbed or reflected when light strikes what type of material

opaque

a colored material that is used to change the color of other substances

pigment

What are the primary light colors?

red, green, blue

What it is called when a wave strikes an object and bounces off

reflection

Why would you want sunglasses with polarized lenses

so there is no glare

list 3 different uses of a laser

surgery, cutting and welding, and CD players

on what does light focus on when it enters the eye

the retina

How often is light refracted in a prism

twice

what color is produced by blending the 3 primary colors of light

white