25_InstSolManual_PDF_Part1

25_InstSolManual_PDF_Part1 - OPTICAL INSTRUMENTS 25 9. A, D...

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Unformatted text preview: OPTICAL INSTRUMENTS 25 9. A, D 10. B, C E 11. D 12. B 13. D 14. A 15. D f and is expressed as f / N . The exposure time is inversely proportional to the D Answers to Multiple-Choice Problems 1. C 2. B 3. E 4. C 5. C 6. B, D 7. D 8. C Solutions to Problems 25.1. Set Up: The f-number N is N 5 aperture diameter. Solve: (a) f / 4 means f f 300 mm 5 4 and D 5 5 5 75 mm. D 4 4 1 2 f D2 2 t1 A2 4 p D2 51 5 . For f / 8, D 5 5 37.5 mm. (b) If t is the exposure time, then 2 2 t2 A1 D1 8 p D1 4 t2 5 t1 Reflect: Larger f-number means smaller aperture diameter and larger exposure time. 12 D1 D2 2 1 5 A 250 s B 12 1 2 75 mm 37.5 mm 2 5 4 250 s5 1 62.5 s 25.2. Set Up: The exposure time is inversely proportional to the aperture area. Solve: If t is the exposure time, then 1 2 D2 2 A2 t1 4 pD2 2 51 5 . 2 t2 A1 D1 4 pD1 t2 5 t1 12 D1 D2 2 1 5 A 30 s B 1 12 8.00 mm 23.1 mm 2 2 1 5 250 s. f . The notation f / N means an f-number of N. D f 35 mm 28 mm 5 16 mm; B: D 5 5 14 mm; . A: D 5 Solve: D 5 f-number 1.7 2.5 250 mm 50 mm 100 mm 5 25 mm; D: D 5 5 29 mm; E: D 5 5 45 mm; C: D 5 2.0 3.5 5.6 350 mm 5 44 mm. The order is B, A, C, D, F, E. F: D 5 8 25.3. Set Up: f-number 5 25.4. Set Up: f-number 5 f . f N means an f-number of N. f 5 135 mm for the telephoto lens and f 5 50 mm for D/ the second lens. The light intensity is proportional to D 2. Solve: (a) Dmin 5 135 mm 135 mm 135 mm 5 6.1 mm; Dmax 5 5 48 mm. For f / 11, D 5 5 12 mm. 22 2.8 11 25-1 ...
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