make, measure and record the angles of incidence accurately using a protractor. observe and use a protractor to measure angles of refraction. What are the variables? In this experiment: ...

When measuring angles: it is always the angle between the ray and the normal that is measured, a protractor is used. Remember to use a ruler and a sharp pencil.

If you need a protractor for any of our lessons and activities, please feel free to print it and use this resource. Find the protractor template below: Protractor by WJLA-TV on Scribd.