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Chapter 25: Q24CQ (page 928)
What is meant by a negative magnification? What is meant by a magnification that is less than 1in magnitude?
Negative magnificence is inverted, and the picture is usually smaller than the item.
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A thin lens has two focal points, one on either side, at equal distances from its center, and should behave the same for light entering from either side. Look through your eyeglasses (or those of a friend) backward and forward and comment on whether they are thin lenses.
Suppose a \(200mm\) focal length telephoto lens is being used to photograph mountains \(10.0km\) away. (a) Where is the image? (b) What is the height of the image of a \(1000m\) high cliff on one of the mountains?
Figure 25.49shows a light bulb between two mirrors. One mirror produces a beam of light with parallel rays; the other keeps light from escaping without being put into the beam. Where is the filament of the light in relation to the focal point or radius of curvature of each mirror?
It can be argued that a flat piece of glass, such as in a window, is like a lens with an infinite focal length. If so, where does it form an image? That is, how areandrelated?
How far from a piece of paper must you hold your father鈥檚 2.25 Dreading glasses to try to burn a hole in the paper with sunlight?
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