When light bounces back from the surface.

A periscope is used to see over walls or other objects. The light is reflected by the two mirrors so that if people look into the periscope at X they will be able to see an object at Y.

Title: To show that light is a form of energy

Apparatus: Radiometer, lamp

Method: Place radiometer in a dark area and note there is no movement. Shine the lamp on the radiometer and observe the solar panels spinning.

Conclusion: Light energy is converted by the radiometer into kinetic energy and the radiometer moves.