Light and Color Test Review 1. What protects us from UV radiation from the sun? I am referring to something in the atmosphere. 2. Colors from our TV set result from color (addition/subtraction). 3. What are the 3 primary colors? 4. Why do you think tennis balls are yellow-green in color? 5. How do you get the colors yellow, magenta and cyan? Why do we see sunsets as red in color? So if the earth’s atmosphere were thicker what color would the sun appear? . 6. Why is the sky blue? (if you missed the explanation in class look it up) What type of lens is a magnifying glass? Is it (converging or diverging)? 7. What kind of image does your eye receive (real/virtual) which means it is (upside down/right side up). 8. Do electromagnetic waves need a medium to travel through? 9. Does light consist of waves/particles/both? Explain why this is so. 10. List the electromagnetic waves from shortest wavelength to longest. 11. What happens to the energy level as the wavelengths decrease? 12. Does the velocity of the waves on the EM spectrum change? What is the velocity of the waves? 13. What kind of EM waves do heat lamps give off 14. What happens to the speed of light when it passes from air through water 15. What 3 types of EM waves does the sun give off? 16. Which one(s) can penetrate through glass? 17. What kind of image is created from a plane mirror? Are the reflected rays convergent or divergent? Where is the image created? 18. What is the difference between a real and virtual image? 19. Do clouds block ultraviolet radiation? Do you need sunscreen when it is cloudy? 20. Define polarization. 21. Why are polarized sunglasses so beneficial? Which light rays do they block out (horizontal/vertical)? 22. What does the law of reflection state 23. Why can we read print from a book in all directions? Because the surface isn’t as smooth as it appears what does is happening to the reflection of light off the white part of the page? Is light traveling in one direction or all directions? 24. Using the same information from number 23, why is it so difficult to see while driving at night when it rains? What is happening to the light? Why do you think soda shops serve their beverages in mugs (think about the root beer video I showed in my powerpoint? Why does this happen? 25. Spherical mirrors can be ______________, like the outside of a spoon. 26. Spherical mirrors can also be __________________, like the inside of a spoon. 27. ________________ mirrors provide wide-angle views for security but also make objects appear farther away than they really are. 29. Find the focal length of a concave mirror with a radius of curvature of 24 cm.