Chapter 25: Q53PE (page 931)
What is the focal length of a makeup mirror that has a power of
Short Answer
The focal length of the mirror is
Chapter 25: Q53PE (page 931)
What is the focal length of a makeup mirror that has a power of
The focal length of the mirror is
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Get started for freeA 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.
The Ray Aspect of Light
Suppose a man stands in front of a mirror as shown in Figure 25.50. His eyes are 1.65 mabove the floor, and the top of his head is 0.13 mhigher. Find the height above the floor of the top and bottom of the smallest mirror in which he can see both the top of his head and his feet. How is this distance related to the man's height?
Image Caption
Figure 25.50A full-length mirror is one in which you can see all of yourself. It need not be as big as you, and its size is independent of your distance from it.
You note that your prescription for new eyeglasses is
A narrow beam of light containing red (
It can be argued that a flat mirror has an infinite focal length. If so, where does it form an image? That is, how are
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