[ Questions #1#20  Questions #21#34  Questions #35#46 ] 
1. The best definition of refraction is ____.
a. passing through a boundary 
b. bouncing off a boundary 
c. changing speed at a boundary 
d. changing direction when crossing a boundary 

Boundary Behavior 
2. If carbon tetrachloride has an index of refraction of 1.461, what is the speed of light through this liquid? (c = 3 x 10^{8} m/s)
a. 4.38 x 10^{8} m/s 
b. 2.05 x 10^{8} m/s 
c. 4.461 x 10^{8} m/s 
d. 1.461 x 10^{8} m/s 

Optical Density and Light Speed 
3. A ray of light in air is incident on an airtoglass boundary at an angle of 30 degrees with the normal. If the index of refraction of the glass is 1.65, what is the angle of the refracted ray within the glass with respect to the normal?
a. 56 degrees 
b. 46 degrees 
c. 30 degrees 
d. 18 degrees 

Snell's Law  Ray Tracing and ProblemSolving 
4. If the critical angle for internal reflection inside a certain transparent material is found to be 48 degrees, what is the index of refraction of the material? (Air is outside the material).
a. 1.35 
b. 1.48 
c. 1.49 
d. 0.743 

The Critical Angle 
5. Carbon disulfide (n = 1.63) is poured into a container made of crown glass (n = 1.52). What is the critical angle for internal reflection of a ray in the liquid when it is incident on the liquidtoglass surface?
a. 89.0 degrees 
b. 68.8 degrees 
c. 21.2 degrees 
d. 4.0 degrees 

The Critical Angle 
6. Carbon tetrachloride (n = 1.46) is poured into a container made of crown glass (n = 1.52). If the light ray in glass incident on the glasstoliquid boundary makes an angle of 30 degrees with the normal, what is the angle of the corresponding refracted ray with respect to the normal?
a. 55.5 degrees 
b. 29.4 degrees 
c. 31.4 degrees 
d. 19.2 degrees 

Snell's Law  Ray Tracing and ProblemSolving 
7. A light ray in air is incident on an air to glass boundary at an angle of 45.0 degrees and is refracted in the glass of 30.0 degrees with the normal. What is the index of refraction of the glass?
a. 2.13 
b. 1.74 
c. 1.23 
d. 1.41 

Determination of n Values 
8. A beam of light in air is incident at an angle of 35 degrees to the surface of a rectangular block of clear plastic (n = 1.5). The light beam first passes through the block and reemerges from the opposite side into air at what angle to the normal to that surface?
a. 42 degrees 
b. 23 degrees 
c. 35 degrees 
d. 59 degrees 

Snell's Law  Ray Tracing and ProblemSolving 
9. A light ray in air enters and passes through a block of glass. What can be stated with regard to its speed after it emerges from the block?
a. speed is less than when in glass 
b. speed is less than before it entered glass 
c. speed is same as that in glass 
d. speed is same as that before it entered glass 

Optical Density and Light Speed 
10. Which of the following describes what will happen to a light ray incident on an airtoglass boundary?
a. total reflection 
b. total transmission 
c. partial reflection, partial transmission 
d. partial reflection, total transmission 

Boundary Behavior Revisited  Total Internal Reflection 
11. Which of the following describes what will happen to a light ray incident on an airtoglass boundary at an angle of incidence less than the critical angle?
a. total reflection 
b. total transmission 
c. partial reflection, partial transmission 
d. partial reflection, total transmission 

Boundary Behavior Revisited  Total Internal Reflection 
12. Which of the following describes what will happen to a light ray incident on an glasstoair boundary at an angle of incidence greater than the critical angle?
a. total reflection 
b. total transmission 
c. partial reflection, partial transmission 
d. partial reflection, total transmission 

Boundary Behavior Revisited  Total Internal Reflection 
13. What is the angle of incidence on an airtoglass boundary if the angle of refraction in the glass (n = 1.52) is 25 degrees?
a. 16 degrees 
b. 25 degrees 
c. 40. degrees 
d. 43 degrees 

Snell's Law  Ray Tracing and ProblemSolving 
14. A ray of white light, incident upon a glass prism, is dispersed into its various color components. Which one of the following colors experiences the greatest amount of refraction?
a. orange 
b. violet 
c. red 
d. green 

Dispersion of Light by Prisms 
15. When light from air hits a smooth piece of glass (n = 1.5) with the ray perpendicular to the glass surface, which of the following will occur?
a. reflection and transmission at an angle of 0 degrees 
b. dispersion 
c. refraction at an angle of 41.8 degrees 
d. all of the above will occur 

Boundary Behavior Revisited  Total Internal Reflection 
16. If total internal reflection occurs at a glassair surface, then _____.

Total Internal Reflection 
17. When light from air hits a smooth piece of glass with the ray perpendicular to the glass surface, the part of the light passing into the glass _____.
a. will not change its speed 
b. will not change its direction 
c. will not change its wavelength 
d. will not change its intensity 

If I Were an Archer Fish 
For Questions #18  #20, consider the diagram below.
18. This person suffers from the problem of ____.
a. nearsightedness 
b. farsightedness 
c. cataracts 
d. delusions 

Farsightedness and its Correction  Nearsightedness and its Correction 
19. This problem could most easily be corrected by the use of a(n) ____.
a. converging lens 
b. diverging lens 
c. achromatic lens 
d. good night's sleep 

Farsightedness and its Correction  Nearsightedness and its Correction 
20. If the image was formed in front of the retina rather than behind the retina, then the person would need to correct the vision problem by using a
a. converging lens 
b. diverging lens 
c. achromatic lens 
d. alarm clock 

Farsightedness and its Correction  Nearsightedness and its Correction 
21. Dispersion occurs when _____.

Dispersion of Light by Prisms 
22. A 3.0 cm tall object is placed along the principal axis of a thin converging lens of 30.0 cm focal length. If the object distance is 40.0 cm, which of the following best describes the image distance and height, respectively?
a. 17.3 cm and 7.0 cm 
b. 120. cm and 9.0 cm 
c. 17.3 cm and 1.3 cm 
d. 120. cm and 1.0 cm 

The Mathematics of Lenses 
23. Which of the following best describes the image for a thin converging lens that forms whenever the object is at a distance less than one focal length from the lens?
a. inverted, enlarged and real 
b. upright, enlarged and virtual 
c. upright, reduced and virtual 
d. inverted, reduced and real 


24. Which of the following best describes the image for a thin diverging lens that forms whenever the magnitude of the object distance is less than that of the lens' focal length?
a. inverted, enlarged and real 
b. upright, enlarged and virtual 
c. upright, reduced and virtual 
d. inverted, reduced and real 


25. An object is placed at a distance of 30.0 cm from a thin converging lens along its axis. The lens has a focal length of 10.0 cm. What are the values of the image distance and magnification (respectively)?
a. 60.0 cm and 2.00 
b. 15.0 cm and 2.00 
c. 60.0 cm and 0.500 
d. 15.0 cm and 0.500 

The Mathematics of Lenses 
26. An object is placed at a distance of 6.0 cm from a thin converging lens along its axis. The lens has a focal length of 9.0 cm. What are the values, respectively, of the image distance and magnification?
a. 18 cm and 3.0 
b. 18 cm and 3.0 
c. 3.0 cm and 0.50 
d. 18 cm and 3.0 

The Mathematics of Lenses 
27. An object is placed at a distance of 30.0 cm from a thin converging lens along the axis. If a real image forms at a distance of 10.0 cm from the lens, what is the focal length of the lens?
a. 30.0 cm 
b. 15.0 cm 
c. 10.0 cm 
d. 7.50 cm 

The Mathematics of Lenses 
28. An object is placed at a distance of 40.0 cm from a thin lens along the axis. If a virtual image forms at a distance of 50.0 cm from the lens, on the same side as the object, what is the focal length of the lens?
a. 22.2 cm 
b. 45.0 cm 
c. 90.0 cm 
d. 200. cm 

The Mathematics of Lenses 
29. Which of the following statements are true of converging lenses? Identify all that apply.

The Anatomy of a Lens  Converging Lenses  ObjectImage Relations 
30. Which of the following statements are true of diverging lenses? Identify all that apply.

The Anatomy of a Lens  Diverging Lenses ObjectImage Relations 
31. Which of the following statements are true of real images? Identify all that apply.

Converging Lenses  ObjectImage Relations  Diverging Lenses ObjectImage Relations  The Mathematics of Lenses 
32. Which of the following statements are true of virtual images? Identify all that apply.

Converging Lenses  ObjectImage Relations  Diverging Lenses ObjectImage Relations  The Mathematics of Lenses 
33. Several characteristics of images are described below. Determine whether these images are real or virtual and whether they are formed by converging, diverging lenses or either type. (In all cases, assume that the object is an upright and real object.)

Converging Lenses  ObjectImage Relations  Diverging Lenses ObjectImage Relations  The Mathematics of Lenses 
34. Which of the following statements are true of total internal reflection (TIR)? Include all that apply.

Total Internal Reflection  The Critical Angle 

Snell's Law  Ray Tracing and ProblemSolving  The Law of Reflection 
36. In the diagrams below, construct refracted rays to indicate the direction which the light rays bend upon crossing the boundary.





The Direction of Bending 
37. Use Snell's law, a protractor and a straightedge to trace the path of light through the following objects.




Snell's Law  Ray Tracing and ProblemSolving 
38. Construct ray diagrams to show where the images of the following objects are located. Draw in the complete image (approximated by an arrow) and describe its characteristics (real or virtual, enlarged or reduced in size, inverted or upright).






















39. The speed of light in a vacuum is 3.00 x 10^{8} m/s. Determine the speed of light through the following materials.

Optical Density and Light Speed 
40. Bruno is standing upon the edge of the water with his highpowered laser gun, waiting to zap the next visible fish with a burst of laser light. Frieda deFish, located a distance of 2.17 m out from shore, hopes to hide from view by ducking behind a small lily pad. If Bruno's laser is located 0.850m above the ground and the lily pad is 1.39 m from shore, then to what depth below the water must Frieda descend in order to be hidden from view? (Given: n_{water} = 1.33)

Snell's Law  Ray Tracing and ProblemSolving 
41. Frieda deFish, disturbed at Bruno's militance, pulls out a laser of her own. She temporarily ducks out from her cover and aims it upwards at an angle of 26.5degrees at Bruno's nose. If Bruno's nose is 1.34m above the water's edge and if Frieda is a distance of 0.91 m below the water's surface, then how far out from shore must Frieda be to have a direct hit?

Snell's Law  Ray Tracing and ProblemSolving 
42. Determine the critical angle for the following boundaries:

Total Internal Reflection  The Critical Angle 
43. A lens produces an upright image of an object. The image is reduced in size by a factor of 3.00 when the object is a distance of 16.9 cm from the lens. Determine the focal length.

The Mathematics of Lenses 
44. A thin lens has a focal point located 19.7 cm from the lens surface. When the object is placed at a specific location, the virtual image it produces is onefourth the size of the object. Determine the object distance. (Careful of your sign on f.)

The Mathematics of Lenses 
45. A thin lens has a focal point located 16.8 cm from the lens surface. Determine the object location which would produce an inverted image which is exactly five times larger than the object.

The Mathematics of Lenses 
46. A thin lens has a focal point located 16.8 cm from the lens surface. Determine the object location which would produce an upright image which is exactly five times larger than the object.

The Mathematics of Lenses 
[ Questions #1#20  Questions #21#34  Questions #35#46 ] 
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