1. Johannes Kepler was better known as a mathematician and astronomer. However, in 1604 he did something different. What was it? He invented the lacemaker's condenser. He published a book about how light travels. He discovered the principles behind the holograph. He discovered that light contains heat.

2. What is an umbra? They are tubes that gases such as neon are sealed in to create lighting. A hat used in South America for shading farmers from the sun. It is the middle of a shadow during solar eclipse. An area in the eye that perceives color.

3. Willebrord Snell solved a problem in 1621. His solution became as 'Snell's Law'. In basic, what is this law? A dependable way of predicting how far light will bend. E=mc2 For every action, there is an equal and opposite reaction. Mirrors do not disperse color, so they are better for use in telescopes than multiple lenses.

4. What is the 'Brockenspekter'? A shadow cast on a cloud and surrounded by colored rings. It is the shiny color put off by the back of a compact disc. It's a long shadow seperated from an object, and once thought to be ghostly. It is the comparison of light to sound.

5. What is white light made from? very small water droplets intense blue light just that, white light a mixture of many other light colors

6. Like sound, light travels in waves. True False

7. Why is ultraviolet (UV) light able to penetrate and burn skin? UV has longer wavelengths than visible light. UV has more energy than visible light. UV is the same thing as infrared. UV is a form of radioactivity released by atomic nuclei.

8. What is light amplification by stimulated emission of radiation? solar energy a laser plasma cosmic rays

9. What is light subtraction? It is shutting out light beams to create a darkened void. It is using the color spectrum to see if stars are moving away from Earth. It is the process of subtraction without borrowing from the next number grouping. It is how things that do not give off light are colored.

10. Light must have something to travel through. When traveling through space, it goes through a substance called 'luminiferous ether'. True False