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1005_Physics ProblemsTechnical Physics

1005_Physics ProblemsTechnical Physics - 346 Q36.6 Image...

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346 Image Formation Q36.6 For definiteness, we consider real objects ( p > 0). (a) For M q p =− to be negative, q must be positive. This will happen in 111 qfp if pf > , if the object is farther than the focal point. (b) For M q p to be positive, q must be negative. From we need < . (c) For a real image, q must be positive. As in part (a), it is sufficient for p to be larger than f . (d) For q < 0 we need < . (e) For M > 1, we consider separately M <− 1 and M > 1. If M q p =− <− 1, we need q p > 1o r qp > or 11 < From pq f += , pp f +> or 21 > or p f 2 < or < 2. Now if −> q p r or we may require q < 0, since then pfq with 1 0 f > gives pq >−
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