2. a magnifying glass is an example of a lens.
a. converging
b. double-concave
c. plano-convex
d. plano-concave
student c
incorrect
reference:

3. if the distance from a converging lens to the object is less than the focal length of the lens, the image will be the object.
a. real, inverted, and smaller than
b. virtual, upright, and larger than
c. virtual, upright, and smaller than
d. real, inverted, and larger than
student a
incorrect
reference:

4. which of the following values represents an index of refraction of an actual material?
a. 25
b. 0
c. 5
d. 1.25
student c
incorrect
reference:

5. which, if any, of these mirrors can produce a real image?
a. plane
b. convex spherical
c. no mirrors can produce a real image.
d. concave spherical
student a
incorrect
reference:

6. when white light is incident on a prism, which one of the resulting color components will have the lowest index of refraction?
a. yellow
b. blue
c. green
d. orange
student c
incorrect
reference:

12. which of the following is not a reason fluorescent lamps are advantageous over incandescent lamps?
a. fluorescent lamps operate at a higher temperature than incandescent lamps.
b. fluorescent lamps are more efficient than incandescent lamps.
c. fluorescent lamps dissipate more energy as light instead of heat than incandescent lamps.
d. fluorescent lamps produce light with less glare than incandescent lamps.
student b
incorrect
reference:

15. which of the following is not a characteristic of electromagnetic waves?
a. they can travel through a vacuum.
b. they can be refracted.
c. they can be reflected.
d. they can travel at various speeds through any one material.
student b
incorrect
reference:

16. a ray at which angle would produce the most glare?
a. 37 degrees
b. 70 degrees
c. 25 degrees
d. 59 degrees
student b
incorrect
reference:

18. which of the following statements is true of glare control?
a. using bulbs that aren't frosted will to diffuse the light and reduce glare.
b. special care must be taken to prevent glare where a low illuminance is required.
c. redirecting lamp fixtures and adjusting bulb types will do little to control glare.
d. indirect lighting is preferred to direct lighting because it produces less glare.
student c
incorrect
reference:

19. which of the following objects uses two converging lenses to produce two images, the second of which is virtual, magnified, and inverted?
a. slide projector
b. compound microscope
c. corrective eyeglasses
d. camera
student d
incorrect
reference:

20. the light intensity of a source is 100 candelas. the illuminance on a surface is 4 lux. how far is the surface from the source?
a. 4 meters
b. 6 meters
c. 5 meters
d. 7 meters
student b
incorrect