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Chapter 34: Q. 76 (page 994)
A concave mirror has a radius of curvature. How far from the mirror must an object be placed to create an upright image three times the height of the object?
An object is placed at away from the concave mirror.
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Consider one point on an object near a lens.
a. What is the minimum number of rays needed to locate its image point? Explain.
b. How many rays from this point actually strike the lens and refract to the image point?
In recent years, physicists have learned to create metamaterials— engineered materials not found in nature—with negative indices of refraction. It’s not yet possible to form a lens from a material with a negative index of refraction, but researchers are optimistic. Suppose you had a planoconvex lens (flat on one side, a 15 cm radius of curvature on the other) that is made from a metamaterial with n = -1.25. If you place an object 12 cm from this lens,
(a) what type of image will be formed and
(b) where will the image be located?
A biologist keeps a specimen of his favorite beetle embedded in a cube of polystyrene plastic. The hapless bug appears to be within the plastic. What is the beetle's actual distance beneath the surface?
A tall object is in front of a converging lens that has afocal length.
Use ray tracing to find the position and height of the image. To do this accurately, use a ruler or paper with a grid. Determine the image distance and image height by making measurements on your diagram.
Calculate the image position and height. Compare with your ray-tracing answers in part .
A light beam passing from medium 2 to medium 1 is refracted as shown in FIGURE Q34.4. Is n1 larger than n2, is n1smaller than n2, or is there not enough information to tell? Explain
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