How is looking at the sun or bright light dangerous?


Targets
At the end of this unit, you should be able to answer the following questions:

1. Where is light found in our world? (sun, electric lights, objects that glow)

1.1 What objects emit their own light? What objects need a light source to be seen?

1.2 How is looking at the sun or bright light dangerous?
2. How does light interact with other materials?

2.1 How can we use light to classify objects as transparent, translucent, or opaque?

2.2 How do objects create shadow?
3. How does light travel?

3.1 What happens when light hits a surface? (absorbed, reflected, or refracted)

3.2 How can light be broken into colours or combined to make a new colour?

3.3 How do various optical devices work?
Targets
When you walk from a dark place out into bright sunlight, what is your reaction?  For most people, the first reaction is to cover their eyes or squint because they are not yet accustomed to the bright light.  Your eyes are very specialized organs that are extremely sensitive to light.  Staring directly at lights that are too bright or certain types of light can damage your eyes.