Refraction

How do you make light bend?

When light rays enter a new medium they change in speed, causing them to bend or change direction.

What is refraction?

The bending of light as it enters a new medium Examples:

Air to water Water to air Water to glass

What is a medium? A material through which a wave (light) travels

Refraction can cause you…..

To see something that may not actually be there.

That is called an Image.

Refraction Animation

Figure 8…

Read the first paragraph on page 188 out loud.

What is the index of refraction?

How much a ray of light bends when it enters a new medium.

Liquids

Carbonated Beverages 1.34 - 1.356Cranberry Juice (25%) 1.351Honey 1.484Ice 1.309Oil, vegetable (50° C) 1.47Shampoo 1.362Water (0° C) 1.33346Water (100° C) 1.31766Water (20° C) 1.33283

Online Example

http://www.snoweria.com/flash/angle_of_refraction.html

What is white light?

All the colors on the visible spectrum

R

O

Y G

B I

V

Can it be separated?

You Bet!!!

Use a prism to separate light into it’s various wavelengths.

THINK: How does a rainbow occur?

White light from the sun enters a rain drop

The rain drop acts as a prism causing the white light to separate.

Displaying the visible spectrum.