What is light?
Why is light important?
How do we use light?
Is light a particle or a wave?
How fast does light travel?
What is invisible light?
What is infrared light?
What are lasers?
What are absorption, reflection, and transmission?
Why do some objects cast shadows?
What are fiber optics?
What are primary colors?
What gives objects their colors?
What is refraction?
How do people see light?
How do our eyes adjust to light?
How does the eye see color?
What are optical illusions?
How do lenses help people see?
What is LASIK?
Light careers
Young scientists at work
Take a light quiz
Fast facts.