Know how to do basic graphing skills. Be able to use a computer mouse to point and click on choices. Know that light can be reflected, refracted, or absorbed by an object. It might be helpful to survey the students background knowledge as it relates to these prerequisites in a number of ways before using the computer lesson. Performing a series of simple demonstrations and discussing how they show the key ideas about light, for example, using a diffraction grating to show the components of white light.
All radiation is harmful.
The spectrum of electromagnetic radiation consists of only visible light. The Sun is not a star. We view all space objects with only an optical telescope. The Hubble Space Telescope can view all objects in space by traveling there to get a better image. Stars are on fire and can burn out.