32.7 ° 41.0 ° 49.0 ° 57.3 °

1. An unpolarized beam of light is incident on a pane of glass (n = 1.56) such that the reflected component coming off the glass is completely polarized. What is the angle of incidence in this case? • 32.7° • 41.0° • 49.0° • 57.3°

2. A beam of light of 650 nm wavelength is incident along the normal to two closely spaced parallel glass plates. For what air gap separation between the plates will the transmitted beam be of maximum intensity? (1 nm = 10-9 m) • 81 nm • 163 nm • 325 nm • 488 nm

3. Two closely spaced parallel glass plates are separated by 750 nm. What wavelength light source in the visible region (390 nm - 710 nm) will experience maximum transmission through the two plates? • 500 nm • 429 nm • 600 nm • 684 nm

4. Two flat glass plates are in contact along one end and are separated by a sheet of paper 4.0 x 10-6 m thick at the other end. The top plate is illuminated by a monochromatic light source of 490 nm wavelength. How many dark parallel bands will be evident across the top plate? (1 nm = 10-9 m) • 7 • 9 • 13 • 17

5. When the sun is located near one of the horizons, an observer looking at the sky directly overhead will view partially polarized light. This effect is due to which of the following processes? • reflection • double refraction • selective absorption • scattering

6. Light of wavelength 610 nm is incident on a slit of width .20 mm and an interference pattern is produced on a screen that is 1.5 m from the slit. What is the width of the central bright fringe? (1 nm = 10-9 m) • 0.68 cm • 0.92 cm • 1.22 cm • 1.35 cm

7. Light of wavelength 610 nm is incident on a slit of width .20 mm and an interference pattern is produced on a screen that is 1.5 m from the slit. What is the distance of the second dark fringe as measured from the center of the bright fringe? (1 nm = 10-9 m) • 0.68 cm • 0.92 cm • 1.22 cm • 35 cm

8. Polarization of light can be achieved using a dichroic material like polaroid by which of the following processes? • reflection • double refraction • selective absorption • scattering

9. Polarization of light can be achieved using birefringent materials by which of the following processes? • reflection • double refraction • selective absorption • scattering

10. A silicon monoxide (n = 1.45) film of 270 nm thickness is used to coat a glass camera lens (n = 1.56). What wavelength of light in the visible region (390 to 710 nm) will be most efficiently transmitted by this system? (1 nm = 10-9 m) • 409 nm • 492 nm • 522 nm • 638 nm

11. What wavelength monochromatic source in the visible region (390 to 710 nm) can be used to constructively reflect off a soap film (n = 1.46) if the film is 77 nm thick? (1 nm = 10-9 m) • 409 nm • 430 nm • 450 nm • 558 nm

12. What wavelength monochromatic source in the visible region (390 to 710 nm) can be used to constructively reflect off a soap film (n = 1.46) if the film is 240 nm thick? (1 nm = 10-9 m) • 467 nm • 562 nm • 587 nm • 480 nm

13. A silicon monoxide (n = 1.45) film of 100 nm thickness is used to coat a glass camera lens (n = 1.56). What wavelength of light in the visible region (390 to 710 nm) will be most efficiently transmitted by this system? (1 nm = 10-9 m) • 400 nm • 492 nm • 624 nm • 580 nm

14. A light source simultaneously emits light of two wavelengths, 480 nm and 560 nm, respectively. The source is used in a double-slit interference experiment where the slit spacing is 0.04 mm and the distance between double slits and the screen is 1.2 m. What is the separation between the second-order bright fringes of the two wavelengths as they appear on the screen? (1 nm = 10-9 m) • 0.16 cm • 0.32 cm • 0.48 cm • 0.64 cm

15. A Young's double slit apparatus is set up where a screen is positioned 1.6 m from the double slits and the spacing between the two slits is 0.04 nm. If the distance between alternating bright fringes is 1.42 cm, what is the light source wavelength? (1 nm = 10-9 m) • 430 nm • 490 nm • 280 nm • 355 nm

16. A Young's double slit apparatus is set up where a screen is positioned 0.8 m from the double slits. If the distance between alternating bright fringes is 0.95 cm and the light source has a wavelength of 580 nm, what is the separation of the double slits? (1 nm = 10-9 m) • 2.8 x 10-5 m • 4.9 x 10-5 m • 5.6 x 10-5 m • 6.0 x 10-5 m

17. A Young's double slit apparatus is set up where the source wavelength is 430 nm and the double slit spacing is 0.04 mm. At what distance from the double slits should the screen be placed if the spacing between alternating bright fringes is to be 2.4 cm? (1 nm = 10-9 m) • 1.6 m • 2.23 m • 2.4 m • 2.9 m

18. A Young's double slit apparatus is set up so that a screen is positioned 1.6 m from the double slits and the spacing between the two slits is 0.04 mm. What is the distance between alternating bright fringes on the screen if the light source has a wavelength of 630 nm? (1 nm = 10-9 m) • 0.016 m • 0.025 m • 0.032 m • 0.047 m

19. In a Young's double slit interference apparatus, by what factor is the distance between adjacent light and dark fringes changed when the separation between slits is tripled? • 1/9 • 1/3 • 1.0 • 3.0

20. In a Young's double slit interference apparatus, by what factor is the distance between adjacent light and dark fringes changed when the separation between slits and screen is tripled? • 1/9 • 1/3 • 1.0 • 3.0

21. In a Young's double slit interference apparatus, by what factor is the distance between adjacent light and dark fringes changed when the wavelength of the source is tripled? • 1/9 • 1/3 • 1.0 • 3.0

22. A Fraunhofer diffraction pattern is created by monochromatic light shining through which of the following? • single slit • double slit • triple slit • more than 3 slits

23. The dark spot observed in the center of a Newton's rings pattern is attributed to which of the following? • polarization of light when reflected • polarization of light when refracted • phase shift of light when reflected • phase shift of light when refracted

24. In order to produce a sustained interference pattern by light waves from multiple sources, which of the following conditions must be met? • sources are coherent • sources are monochromatic • sources are either coherent or monochromatic • none of these

25. What is the minimum thickness of a soap bubble film (n = 1.46) on which light of wavelength 500 nm shines, assuming one observes constructive interference of the reflected light? • 63 nm • 86 nm • 125 nm • 172 nm

26. Light of wavelength 500 nm shines on a soap bubble film (n = 1.46). For what soap film thickness, other than the minimum thickness, will constructive interference occur? • 63 nm • 86 nm • 172 nm • 257 nm

27. A silicon monoxide thin film (n = 1.45) of thickness 97.4 nm is applied to a camera lens made of glass (n = 1.58). This will result in a destructive interference for reflected light of what wavelength? • 720 nm • 616 nm • 565 nm • 493 nm

28. A Young's double slit has a slit separation of 3.0 x 10-5 m on which a monochromatic light beam is directed. The resultant bright fringe separation is 2.15 x 10-2 m on a screen 1.2 m from the double slit. What is the separation between the third order bright fringe and the zeroth order fringe? • 60 x 10-2 m • 6.45 x 10-2 m • 4.30 x 10-2 m • 2.15 x 10-2 m

29. A beam of unpolarized light in air strikes a flat piece of glass at an angle of incidence of 57.33°. If the reflected beam is completely polarized, what is the index of refraction of the glass? • 1.60 • 1.56 • 1.52 • 2.48

30. If a wave from one slit of a Young's double slit set-up arrives at a point on the screen one wavelength behind the wave from the other slit, what is observed at that point? • dark fringe • bright fringe • multi-colored fringe • grey fringe, neither dark nor bright

31. The blue tint of a coated camera lens is largely caused by what effects? • diffraction • refraction • polarization • interference

32. A Young's double slit has a slit separation of 4.0 x 10-5 m on which a monochromatic light beam is directed. The resultant bright fringes on a screen 1.20 m from the double slit are separated by 2.15 x 10-2 m. What is the wavelength of this beam? (1 nanometer = 10-9 m) • 573 nm • 454 nm • 717 nm • 667 nm

33. Interference effects observed in the early 1800's were instrumental in supporting a concept of the existence of which property of light? • polarization • particle nature • wave nature • electro-magnetic character

34. If the polarizing angle for cubic zirconia is 65.6°, what is the index of refraction of this material? • 2.00 • 2.20 • 2.42 • 2.65

35. The critical angle for sapphire surrounded by air is 34.4°. Calculate the polarizing angle for sapphire. • 60.5° • 59.7° • 58.6° • 56.3°

36. Sunlight reflected from a smooth ice surface is completely polarized. Determine the angle of incidence. (nice = 1.309) • 25.60° • 47.89 ° • 52.62 ° • 56.26 °

37. A hair is placed at one edge between two flat glass plates. When this arrangement is illuminated with yellow light of wavelength ( λ = 600 nm), a total of 121 dark bands are counted starting at the point of contact between the plates. How thick is the hair? • 3.6 x 10-5 m • 1.8 x 10-5 m • 3.6 x 10-4 m • 1.8 x 10-4 m

38. A thin film of magnesium fluoride (n = 1.38) is used to coat a camera lens (n = 1.56). Which of the following thicknesses of coating will not allow any strong reflections in the visible spectrum ( λ = 390 nm to λ = 700 nm)? • 1 x 10-5 cm • 2 x 10-5 cm • 5 x 10-5 cm • 1 x 10-4 cm

39. How far above the horizon is the moon when its image reflected in calm water is completely polarized? (nwater = 1.333) • 7.7° • 16.6° • 22.2° • 36.87°

40. A possible means for making an airplane radar-invisible is to coat the plane with an antireflective polymer. If radar waves have a wavelength of 3 cm and the index of refraction of the polymer is n = 1.5, how thick would the coating be? • 1 mm • 2 mm • 5 mm • 2 cm

41. The blue light from the sky has been polarized by? • selective absorption. • reflection. • double refraction. • scattering.

42. A Young's interference experiment is conducted with blue-green argon laser light ( λ = 515 nm). The separation between the slits is 0.5 mm and the interference pattern appears on a screen 3.3 m away. What is the spacing between the bright fringes? • 1.7 mm • 3.4 mm • 5.1 mm • 6.8 mm

43. Helium-neon laser light ( λ = 632.8 nm) is sent through a 0.3 mm-wide single slit. What is the width of the central maximum on a screen 1 m in back of the slit? • 2.02 mm • 3.13 mm • 4.22 mm • 5.31 mm

44. A soap bubble (n = 1.35) is floating in air. If the thickness of the bubble wall is 300 nm, which of the following wavelengths of visible light is strongly reflected? • 620 nm (red) • 580 nm (yellow) • 540 nm (green) • 500 nm (blue)

45. A thin layer of oil (n = 1.25) is floating on water (n = 1.33). How thick is the oil in the region that reflects green light ( λ = 530 nm)? • 212 nm • 313 nm • 404 nm • 500 nm

46. When light from a single point passes through calcite it often forms two images, each of which is formed from light that has been polarized by? • selective absorption. • reflection. • double refraction. • scattering.

47. Light is reflecting off a wedge-shaped thin piece of glass producing bright and dark interference fringes. If a certain location has a bright fringe, a nearby point will have a dark fringe if the thickness of the glass increases by? • 1/8 of a wavelength of the light. • 1/4 of a wavelength of the light. • 1/2 of a wavelength of the light. • one wavelength of the light.

48. Which statement is correct? • A double slit interference pattern does not require diffraction. • A single slit diffraction pattern does not require interference. • Diffraction, refraction, and reflection all can cause the path of light not to be a straight line path. • Polarization involves interference.

49. Polaroid sunglasses help when skiing on snow on a sunny day by reducing the sunlight from the snow. This light from the snow has been polarized by? • selective absorption. • reflection. • double refraction. • scattering.

50. Polaroid material made from a dichroic substance polarizes light by? • selective absorption. • reflection. • double refraction. • scattering.