(7%) Problem 11: Suppose a book is held 6.8 cm from a 10.5-cm focal length lens.
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Question
(7%) Problem 11: Suppose a book is held 6.8 cm from a 10.5-cm focal length lens. 50% Part (a) Find the magnification of the mage of the book. Grade Summa Deductions Potential 0% 100% sin tan() ( cosO cotanasinacos atan acotanO sinh coshO tanhcotanh0 Submissions Attempte remaining: 12 (5% per attempt) - detailed view END Degrees Radians Submit Hint I give upt Hints: 5% deduction per hint Hints remaining:- Feedback: 2% deduction per feedback. 50% Part (b) Find the magnification of the lens when the book is held 8.7 cm from the magnifier. All costent 8 2017 Expert TA LLCExplanation / Answer
a) Given,
f = 10.5 cm
do = 6.8 cm
1/f = 1/do + 1/di
di = (1/f - 1/di)^-1
di = (1/10.5 - 1/6.8)^-1
di = -19.297 cm
magnification = -di/do = 19.297/6.8 = 2.837
b)
f = 10.5 cm
do = 8.7 cm
1/f = 1/do + 1/di
di = (1/f - 1/di)^-1
di = (1/10.5 - 1/8.7)^-1
di = - 50.75 cm
magnification = -di/do = 50.75/8.7 = 5.833
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