Rays are introduced as a method of representing the path of light, and are used to show that light always travels in straight lines. Simulations allow students to move mirrors to redirect light and look at a model of a periscope.

This item teaches:

• about the use of straight lines to represent rays of light
• about the angles of incidence and reflection in a plane mirror
• the limitations of using straight lines to represent rays of light
• the construction of ray diagrams to demonstrate the formation of an image by a plane mirror
• about the reflection of light in a periscope