1Phys1230 --- Third exam, May, 2006. Name: Recent material. Short answer. ID no.: _____________________________ Chapters 12, 14, 13, and 8. 1-2. List two depth cues that a one-eyed person could not use _______________________ _______________________ 3-4. List two depth cues that a one-eyed person could use _______________________ _______________________ 5-6. Laser light with frequency f and wavelength λ passes through the grating below and creates a bright spot at the tip of the triangle. The distance X should be equal to _________________________ 7-8. Two laser beams are incident upon a screen. The view of the beams is from the top. Draw in the box what the pattern looks like that appears on the wall. d d+X29-10. In the above question, the screen is replaced with a high quality photographic film and a photo is made of the pattern. A laser beam is shined on the pattern. What can you say about the scattered beam?? 11.-12. Sketch a setup for making a hologram of a teacup. Label the parts with words. 13-17. Sketch and label the parts of a liquid crystal display. Indicate the orientation of the polarization of the filters. 18-19. Explain what the liquid crystals do that allows light to be passed. 22-23. The word viewed through a certain kind of crystal looks “double.” Write a sentence explaining why. CALCITE CALCITE3Phys1230 - - - Light and Color for Nonscientists --- Third exam, May, 2006 Part I. Answer these questions on the Scantron card. Ch. 8, Binocular vision and depth perception and Ch. 12, Wave Optics. 1. With one eye, your field of view is about ______ degrees. a. 18 b. 65 c. 80 d. 130 e. 208 2. When viewing with red-blue 3-d glasses, the eye with the red filter sees the blue image and the eye with the blue filter sees the red image. (T/F). _____________________________________________ Which of these effects a. Perspective b. Convergence c. Contrast d. Highlight e. Shadow would be a good choice for an artist to use for 3. Raindrops on a windshield 4. To distinguish a Frisbee from a beach ball 5. A view down a sidewalk _____________________________________________ You view a 3-d picture with red-blue glasses: 6. If the picture is turned upside down, are the near things still near (T/F) 7. If the glasses are turned upside down, are the near things still near (T/F) Reflections from surfaces can be a) hard or b) soft. 8. The reflection from the front side of pane of glass is…? 9. The reflection from the back side of pane of glass is …? Below are stereo loudspeakers placed 1 meter apart. The sound they emit has a wavelength of 2 meters. The speakers are in phase. The possible answers are a) loud and b) quiet. 10. What do you hear at C? 11. What do you hear at D? 1 meter 12. The speakers are changed so that they emit sound out of phase. The sound at C is now…? C D413. A loudspeaker emits sound frontward and backward. The speaker is placed a distance x in front of a wall. To have the sound reflection from the wall cancel the sound straight from the speaker, the distance x should be. a. λ / 8 b. λ / 4 c. λ / 2 d. λ e. None of these 14. Beams from two lasers, red and blue, are passed through a grating. Which beam is diffracted through the largest angle? a. red b. blue Ch. 13 Scattering and Polarization and Ch. 14 Holography: 15. You can view a hologram with incoherent white light (T/F). 16. You can make a hologram with incoherent light (T/F). 17. You can make a hologram with white light. (T/F). 18. If you break a hologram in half, you only see half the image in each piece. (T/F). 19. A laser beam is shined into an aquarium from the left side. The aquarium is at eye level. Light is scattered from tiny particles in the water. The scattered light is a. vertically polarized b. horizontally polarized c. unpolarized d. plagiarized 20. Sunlight scattered from the hood of your car is a. vertically polarized b. horizontally polarized c. unpolarized d. hoodwinked 21. A polarizing filter makes clouds stand out in a photograph because a. polarized light from the clouds is passed b. polarized light from the clouds is blocked c. polarized light from the sky is blocked d. polarized light from the sky is passed e. light reflected from water is polarized 22. Below are shown two polarizing filters. One passes horizontally polarized light and the other is oriented to pass light at 45 degrees to horizontal. What gets through? a. All b. None c. An amount in between all and none. Check your Scantron. You should have filled in 22 questions.