Light = straight pathLight = straight path

An atom:emits light when an electron moves from

a high to a low energy level.  

absorbs energy as its electronsmove from a low to a high energy level.

 

The three primary colors of light arered, green, and blue.

 

The three primary pigment colors are:magenta, cyan, and yellow.

  •

The primary colors used to construct an image on a color TV monitor are:

  

red, green & blue.

Light can have different colors because it can have different:

frequencies, wavelengths and energies

A laser is a device that emitsa single frequency of light.

   

X

  

The pictures represent the strength of signals reaching the brain from the color

receptors in the eye. Filled boxes indicate a strong signal. Empty boxes represent no signal.

NEXT

 

Which picture represents someone seeing the color we think of as RED?

as WHITE? as BLACK?

 

B = red

A = white

D = Black

We see a tree because of light__________ by the tree.

  

reflected

Why is this cloth blue?  

                                     

The cloth absorbs all colors except blue; reflects only blue light to our eyes.

Filters absorb some colors & transmit others as light passes

If white light through a red filterthe filter allows the passage of

  

Absorbs all the colors except red….red passes through

If a laser printer mixes yellow & magenta pigment on the paper, it produces:

  

red

The dotted line perpendicular to the surface is called the:

  

NORMAL

The angle of incidence is identified as:  

B

Ray #2 is called the: 

reflected ray

A converging lens changes the direction of light through the process of:

  

refraction

rays of light cross after they have been bent by a converging lens at the focal point.

In the picture below, the person sees the fish image in a different

location than the actual fish because:

  

The light rays reflected from the fish bend at the surface of the water.

The index of refraction best describes:the ability of a material to bend light

rays.  Material n

Vacuum 1.00

Air 1.0003

Water 1.33

Plastic 1.49

Glass 1.56

Diamond 2.41

A light ray strikes a lens parallel to the axis of the lens. Which of the following

rays best represents the path of the light ray as it leaves the lens?

   

Ray a

The human focuses on objects that are near & far away because:

  

the lens changes shape

Types of Lenses

A fiber optic, (or light pipe) traps and transmits light inside its core as pictured

in the diagram.

The light is trapped because of total internal reflection.