Refraction Animation (by Phet)

Starter activity

Click Intro

Set up an air to glass boundary (air at the top, glass at the bottom)

Bring in the protractor

Click the red button to switch on the light ray.

Try moving the incident ray to different angles, 10, 20,30,40,50 degrees. Note the refraction angle and the reflection angle in each case.

What is happening to the angle of reflection as the incident angle increases?

What happens to the angle of refraction as the incident angle increases?