12_Ch 23 College Physics ProblemCH23 Mirrors and Lenses

12_Ch 23 College Physics ProblemCH23 Mirrors and Lenses -...

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278 CHAPTER 23 23.18 The magnified, real images formed by concave mirrors are inverted. Thus, 0 M < giving 4 q M p =− , or Then, 4 qp = 2111 Rpqp =+=+ 1 5 44 p p = or () 88 30.0 cm 48.0 cm 55 Rp == = 23.19 (a) An image formed on a screen is a real image. Thus, the mirror must be concave since, of mirrors, only concave mirrors can form real images of real objects. (b) The magnified, real images formed by concave mirrors are inverted, so 0 M < and 5 q M p , or 5.0 m 1.0 m q p = The object should be 1.0 m in front of the mirror (a – revisited) The focal length of the mirror is 11 1 6 1.0 m 5.0 m 5.0 m
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