You may also want to explore other activities related to light under Lesson Plan Ideas or Student Activities for the school program . The optic nerve at the back of the eye connects to the central nervous system in the brain. The brain can be thought of as a giant filing cabinet which collects and files the information we receive from our eyes and stores it all in the memory. When we see a familiar object, such as a chair, we use our eyes, memory and imagination to interpret information relating to its structure and function.
Light is a form of radiant energy.
We only see a very small portion of what is called the electromagnetic spectrum. If you hold a magnifying glass in the sunlight and focus it on a piece of paper, you can burn a hole in the paper. This heat energy does not come from the magnifying glass. It comes from the Sun, and includes not only visible light but also ultra violet and infra-red energy. You are right if you said the sources are Sun, stars, fire, candle, lightbulb, and flashlight.