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Chapter 34: Q. 77 (page 994)
A tall object is placed in front of a mirror. A tall upright image is formed behind the mirror, from the object. What is the focal length of the mirror?
The focal length of the mirror is.
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To a fish in an aquarium, the -thick walls appear to be only thick. What is the index of refraction of the walls?
You鈥檙e visiting the shark tank at the aquarium when you see a 2.5-m-long shark that appears to be swimming straight toward you at 2.0 m/s. What is the shark鈥檚 actual speed through the water? You can ignore the glass wall of the tank.
A goldfish lives in a -diameter spherical fish bowl. The fish sees a cat watching it. If the cat's face is from the edge of the bowl, how far from the edge does the fish see it as being? (You can ignore the thin glass wall of the bowl.)
A spherical mirror of radius R has its center at C, as shown in FIGURE P34.78. A ray parallel to the axis reflects through F, the focal point. Prove that f = R/2 if
Some electro-optic materials can change their index of refraction in response to an applied voltage. Suppose a planoconvex lens (flat on one side, a 15.0 cm radius of curvature on the other), made from a material whose normal index of refraction is 1.500, is creating an image of an object that is 50.0 cm from the lens. By how much would the index of refraction need to be increased to move the image 5.0 cm closer to the lens?
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