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Chapter 34: Q. 8 (page 989)
A converging lens creates the image shown in FIGURE Q34.8. Is the object distance less than the focal length f, between f and 2 f, or greater than 2 f? Explain
The object is between f and 2f away.
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Find the focal length of the glass lens in FIGURE EX
A fish in a flat-sided aquarium sees a can of fish food on the counter. To the fish's eye, the can looks to be outside the aquarium. What is the actual distance between the can and the aquarium? (You can ignore the thin glass wall of the aquarium.)
The meter stick in FIGURE P34.48 lies on the bottom of a 100-cm long tank with its zero mark against the left edge. You look into the tank at a 30掳 angle, with your line of sight just grazing the upper left edge of the tank. What mark do you see on the meter stick if the tank is (a) empty, (b) half full of water, and (c) completely full of water?
Suppose you have two pinhole cameras. The first has a small round hole in the front. The second is identical except it has a square hole of the same area as the round hole in the first camera. Would the pictures taken by these two cameras, under the same conditions, be different in any obvious way? Explain.
A keratometer is an optical device used to measure the radius of curvature of the eye鈥檚 cornea鈥攊ts entrance surface. This measurement is especially important when fitting contact lenses, which must match the cornea鈥檚 curvature. Most light incident on the eye is transmitted into the eye, but some light reflects from the cornea, which, due to its curvature, acts like a convex mirror. The keratometer places a small, illuminated ring of known diameter 7.5 cm in front of the eye. The optometrist, using an eyepiece, looks through the center of this ring and sees a small virtual image of the ring that appears to be behind the cornea. The optometrist uses a scale inside the eyepiece to measure the diameter of the image and calculate its magnification. Suppose the optometrist finds that the magnification for one patient is 0.049. What is the absolute value of the radius of curvature of her cornea?
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