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Chapter 25: Q27CQ (page 928)
Devise an arrangement of mirrors allowing you to see the back of your head. What is the minimum number of mirrors needed for this task?
The minimum number of mirrors required is two for this task.
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A ray of light, emitted beneath the surface of an unknown liquid with air above it, undergoes total internal reflection as shown in Figure 25.55. What is the index of refraction for the liquid and its likely identification?
Figure 25.5 A light ray inside a liquid strikes the surface at the critical angle and undergoes total internal reflection.
Why is the front surface of a thermometer curved as show
(a) What is the focal length of a magnifying glass that produces a magnification of \(3.00\) when held \(5.00{\rm{ }}cm\) from an object, such as a rare coin? (b) Calculate the power of the magnifier in diopters. (c) Discuss how this power compares to those for store-bought reading glasses (typically \(1.0\) to \(4.0\)). Is the magnifier’s power greater, and should it be?
(a) Using information in Figure \(25.23\), find the height of the instructor’s head above the water, noting that you will first have to calculate the angle of incidence. (b) Find the apparent depth of the diver’s head below water as seen by the instructor.
What are the differences between real and virtual images? How can you tell (by looking) whether an image formed by a single lens or mirror is real or virtual?
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