Conceptual Physics

Chapter Assumptions

Unless stated otherwise, the incident medium is air, with an index of refraction of 1.00.

Chapter 32 Problems

Conceptual Problems

C.1 Sparkle refers to percentage of light out to light in. Why do cut diamonds, whose index of refraction is 2.42, sparkle more than

identically cut glass with an index of refraction of 1.60? Diamonds are cut so that a maximum of the light entering the

diamond's top eventually leaves through the top.

C.2 If a fish in a still river tries to look up out of the

water at an angle (measured from the vertical)

that is greater than the critical angle, will he be

able to see the world of air? If not, what will he

see?

Yes No

Section Problems

Section 0 - Introduction

0.1 Use the simulation in the interactive problem in this section to answer the following questions. Consider the smaller angles

between the laser's path and the dashed normal line. (a) Which is larger, the angle in the air, or the angle in the water? (b)

When you shoot a laser from a helicopter toward a submarine, does the laser bend toward or away from the dashed normal

line as it changes media?

(a) Air Water

(b) Toward Away from

Section 2 - Index of refraction

2.1 A laser pulse travels directly through a flint glass plate that is 0.150 mm thick, and then through a diamond sliver that is

0.130 mm thick. In which substance does the pulse spend more time?

Flint glass

Diamond

2.2 Yellow light travels 0.680 times as fast in a certain type of plastic than in a vacuum. What is the index of refraction for yellow

light in the plastic?

2.3 At what speed does light of wavelength 589 nm travel in flint glass? Flint glass has an index of refraction of 1.61 for that

wavelength.

m/s

2.4 Red light travels at 2.07×10^8 m/s in a particular type of oil. What is the index of refraction for red light in the oil?

Section 3 - Snell’s law

3.1 A beam of light travels from a medium with an index of refraction of 1.25 to a medium with an index of refraction of 1.46. If the

incoming beam makes an angle of 14.0° with the normal, at what angle from the normal will it refract?

°

3.2 A beam of light travels from a medium with an index of refraction of 1.65 to a medium with an index of refraction of 1.30. If the

beam refracts at an angle of 23.5° from the normal, at what angle to the normal did it enter the second medium?

°

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