5_Chapter 25 HomeworkCH25 Optical Instruments

5_Chapter 25 HomeworkCH25 Optical Instruments - Optical...

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Optical Instruments 341 Problem Solutions 25.1 Using the thin lens equation, the image distance is ( )( ) 150 cm 25.0 cm 30.0 cm 150 cm 25.0 cm pf q pf == = −− so the image is located 30.0 cm beyond the lens . The lateral magnification is 30.0 cm 1 150 cm 5 q M p =− = − 25.2 The f -number of a camera lens is defined as -number focal length diameter f = . Therefore, the diameter is 55 mm 31 mm -number 1.8 f D f = 25.3 The thin lens equation, 111 p qf += , gives the image distance as ( )( ) 3 100 m 52.0 mm 52.0 mm 100 m 52.0 10 m pf q = × From the magnitude of the lateral magnification, M hh qp , where the height of
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