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Chapter 34: Q5Q (page 1037)
When a T. rex pursues a jeep in the movie Jurassic Park, we see a reflected image of the T. rex via a side-view mirror, on which is printed the (then darkly humorous) warning: 鈥淥bjects in mirror are closer than they appear.鈥� Is the mirror flat, convex, or concave?
The mirror is convex.
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A moth at about eye level isin front of a plane mirror; a man is behind the moth,from the mirror. What is the distance between man鈥檚 eyes and the apparent position of the moth鈥檚 image in the mirror?
An object is placed against the center of a thin lens and then moved away from it along the central axis as the image distance is measured. Figure 34-41 gives i versus object distance p out to . What is the image distancewhen ?
In Fig. 34-52, an object is placed in front of a converging lens at a distance equal to twice the focal length of the lens. On the other side of the lens is a concave mirror of focal lengthseparated from the lens by a distance . Light from the object passes rightward through the lens, reflects from the mirror, passes leftward through the lens, and forms a final image of the object. What are (a) the distance between the lens and that final image and (b) the overall lateral magnification M of the object? Is the image (c) real or virtual (if it is virtual, it requires someone looking through the lens toward the mirror), (d) to the left or right of the lens, and (e) inverted or non-inverted relative to the object?
A fruit fly of height H sits in front of lens 1 on the central axis through the lens. The lens forms an image of the fly at a distance from the fly; the image has the fly鈥檚 orientation and height . What are (a) the focal length of the lens and (b) the object distance of the fly? The fly then leaves lens 1 and sits in front of lens 2, which also forms an image at that has the same orientation as the fly, but now . What are (c) and (d) ?
A simple magnifier of focal length is placed near the eye of someone whose near point is . An object is positioned so that its image in the magnifier appears at. (a) What is the angular magnification of the magnifier? (b) What is the angular magnification if the object is moved so that its image appears at infinity? For , evaluate the angular magnifications of (c) the situation in (a) and (d) the situation in (b). (Viewing an image atrequires effort by muscles in the eye, whereas viewing an image at infinity requires no such effort for many people.)
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