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Chapter 25: Q53PE (page 931)
What is the focal length of a makeup mirror that has a power of
The focal length of the mirror is .
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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?
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.
There was a major collision of an asteroid with the Moon in medieval times. It was described by monks at Canterbury Cathedral in England as a red glow on and around the Moon. How long after the asteroid hit the Moon, which is 3.84 x 105 kmaway, would the light first arrive on Earth?
Diffusion by reflection from a rough surface is described in this chapter. Light can also be diffused by refraction. Describe how this occurs in a specific situation, such as light interacting with crushed ice.
Suppose you have an unknown clear substance immersed in water, and you wish to identify it by finding its index of refraction. You arrange to have a beam of light enter it at an angle of , and you observe the angle of refraction to be. What is the index of refraction of the substance and its likely identity?
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