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46 True/False questions

  1. parallel rayterm for a ray that travels parallel to the principal axis, and then refracts through the mirror to the principal focal point

          

  2. normalterm for nearsightedness

          

  3. focal rayterm for a ray that aproaches the lens through the focal point

          

  4. increaseThe wavelength of light entering an optically denser medium must _____.

          

  5. refractometerterm for the bending of light rays at the boundary between two media differing in optical density

          

  6. myopiaterm for nearsightedness

          

  7. critical angleWhen the angle of incidence reaches the ____ ___, the angle of refraction becomes 90 degrees.

          

  8. concaveterm for a bulging surface with the same curvature as the surface of a sphere

          

  9. secondary focal pointanother term for the focal length

          

  10. double concave lensesthe most important diverging lenses

          

  11. positiveConvergenging lenses have a _____ (positive, negative) focal length.

          

  12. mirageThe wavelength of light entering an optically denser medium must _____.

          

  13. transmitted, reflectedIf both media are transparent, but have different optical densities, some light is ____ and some is ____.

          

  14. double convex lensesthe most important diverging lenses

          

  15. diopterA ____ of water is due to the refraction of sunlight as it passes through hot, expanding air at ground level.

          

  16. refractive indexterm for the bending of light rays at the boundary between two media differing in optical density

          

  17. optical densityterm for the center of the lens

          

  18. n1 sin θ1 = n2 sin θ2the first law of refraction

          

  19. angle of incidenceterm for the angle between an incoming ray and the normal to the boundary

          

  20. refractionterm for the bending of light rays at the boundary between two media differing in optical density

          

  21. optical centerterm for a material's resistance to the transmission of light waves

          

  22. hyperopiaterm for nearsightedness

          

  23. wavelength, speedWhen light enters a new medium, _____ and ___ change.

          

  24. real imageterm for actual light rays intersecting after refraction

          

  25. central rayterm for a ray that aproaches the lens through the focal point

          

  26. planarterm for the perpendicular to a plane at the point of tangency

          

  27. focal lengthterm for the distance from the optical center to the principal focal point

          

  28. myopia and hyperopiaterm for farsightedness

          

  29. Snell's lawanother term for the simple relationship expressed by the first law of refraction

          

  30. convexterm for a bulging surface with the same curvature as the surface of a sphere

          

  31. principle of reversibilityprinciple that states that the path of a light ray subjected to reflection or refraction is traced in reverse by any ray coming along the path in the opposite reaction

          

  32. virtual imageterm for light rays extending from a lens in order to intersect

          

  33. principal axisWhen the angle of incidence reaches the ____ ___, the angle of refraction becomes 90 degrees.

          

  34. 1/f = (n-1) (1/r1 - 1/r2)the thin lens equation

          

  35. principal focal pointterm for the point of convergence on the opposite side of the lens, to which rays are directed

          

  36. negativeConvergenging lenses have a _____ (positive, negative) focal length.

          

  37. optical planeterm for a plane perpendicular to the principal axis at the optical center

          

  38. absorbed, reflectedIf both media are transparent, but have different optical densities, some light is ____ and some is ____.

          

  39. 1/f = 1/do + 1/dithe thin lens equation

          

  40. total internal reflectionIf both media are transparent, but have different optical densities, some light is ____ and some is ____.

          

  41. angle of refractionterm for the bending of light rays at the boundary between two media differing in optical density

          

  42. transmittedIf two adjoining media have the same optical density, light is fully _____.

          

  43. diverging lensesterm for lenses that spread parallel rays apart

          

  44. P = 1/fterm to describe a flat surface

          

  45. decreaseThe wavelength of light entering a medium of lower optical density must ______.

          

  46. convergig lensesterm for lenses that redirect parallel rayst oward a point of convergence