The lens, diffraction and photon game

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

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

3. 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

4. 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

5. 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

6. 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.

7. 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

8. 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

9. 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

10. 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.

11. 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.

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

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

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

15. 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

16. 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

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

18. 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

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

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

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

22. 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

23. 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

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

25. 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.

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

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

28. 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

29. 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.

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

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

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