11_Chapter 23 HomeworkCH23 Mirrors and Lenses

11_Chapter 23 HomeworkCH23 Mirrors and Lenses - Mirrors and...

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Mirrors and Lenses 277 23.15 The focal length of the mirror may be found from the given object and image distances as 111 fp =+ q , or ( )( ) 152 cm 18.0 cm 16.1 cm 152 cm 18.0 cm pq f == = + ++ For an upright image twice the size of the object, the magnification is 2.00 q M p =− 2.00 qp giving Then, using the mirror equation again, p qf + = becomes 1 2 2.0 1 1 0 p p p f +=− = = or 16.1 cm f p 8.05 cm = 23.16 A convex mirror ( ) 0 R < produces upright, virtual images of real objects. Thus, 0 M > giving 1 3 q p M , or 3 p q
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This document was uploaded on 10/20/2011.

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