The lens, diffraction and photon game Lots of fun! Win valuable prizes!

1. A magnifying glass is a converging lens. diverging lens. combination of diverging and converging lenses.

2. An image formed by a single diverging lens is larger than the object. can be projected on a wall. is upside down. is virtual. all of the above

3. An image of a distant object formed by a single converging lens is upside down. can be focused on a screen. is real. can be projected on a wall. all of the above

4. A converging lens refracts parallel rays of light. converges parallel rays of light. bends parallel rays of light so they cross at a single point. is thicker in the center than at the edges. all of the above

5. Suppose you hold a converging lens in front of a window 5. Suppose you hold a converging lens in front of a window. An image of some distant hills can be focused on your hand, behind the lens. The focal point of this lens is located behind your hand. approximately at your hand. in front of your hand.

6. If an object is located between the focal point and a converging lens, the image will be upside down. larger than the object. real. all of the above none of the above

7. In drawing a ray diagram, rays can be drawn through the center of the lens. through the focal point in front of the lens. parallel to the principal axis of the lens. from the tip of the object arrow. all of the above

8. Ray diagrams are used to find the focal point of a lens. draw pretty pictures. figure out where an image will be located figure out what kind of lens is being used. all of the above

9. Huygens' principle says that when light passes through two narrow slits, it produces an interference pattern. when the crests of waves overlap, their individual effects add together. light waves bend slightly when passing through an opening. all points on a wave front are connected. each point on a wave front acts as a new source of wavelets.

10. Suppose you stand 3 m in front of a flat mirror 10. Suppose you stand 3 m in front of a flat mirror. How far away from you is your image? 6 m. 3 m. 1 m. 1/3 m. 1/6 m.

11. The image your eye receives is right-side up. upside down.

12. Which instrument is a human eye most similar to? microscope telescope camera projector

13. Monochromatic light refers to light that is one color. a chrome color. red. white. all of the above

14. When monochromatic light shines through two closely spaced narrow slits and onto a screen some distance away, the pattern on the screen has alternating dark and light bands. no light in it. one large bright spot. two large bright spots. none of the above

15. Destructive interference occurs when the crests of two waves overlap. the crest of one wave meets the trough of another wave. two waves of the same color overlap. all of the above none of the above

16. Colors seen when gasoline forms a thin film on water are a demonstration of refraction. diffraction. dispersion. interference. polarization.

17. An interference pattern is produced when light passes through two narrow slits. two or more light waves meet. the crests of two waves meet. the troughs of two waves meet. all of the above

18. Interference can be shown by using sound waves. water waves. light waves. all of the above none of the above

19. Light emitted by a laser is coherent. incoherent.

20. Coherent light is many different rays of light all having the same direction. wavelength. frequency. phase. all of the above

21. An object is placed in front of a convex lens as shown below. Which ray(s) will pass through the right focal point, F, after refraction? 1 only both 1 and 2 1, 2, and 3 2 only 3 only

22. Which one of the following pairs of terms best describes the image formed by the lens in the ray diagram above? real, upright real, inverted virtual, inverted virtual, upright

23. Which of the following photons have the greatest energy? green light ultraviolet yellow light blue light red light

24. A photocell can be activated with blue light but not with red light. This is because blue light has a higher frequency than red light. a longer wavelength than red light. a higher speed than red light. a stronger electric field than red light. none of the above.

25. The photoelectric effect best demonstrates the wave nature of light. particle nature of light. both A and B none of the above

26. Light behaves as a particle. wave. both A and B none of the above

27. Which of the following forms an interference pattern when directed towards two suitably spaced slits? Sound Light Electrons all of the above none of the above

28. When an atomic electron goes from a high- energy state to a low-energy state, it emits a photon. absorbs a photon. neither absorbs nor emits a photon.

29. Electron wavelengths, in general, are longer than light wavelengths. the same as light wavelengths. shorter than light wavelengths.

30. A beam of electrons has wave properties. particle properties. both A and B none of the above

31. The energy states available to an electron are quantized. continuous.