12:25 PM iPad 22% ust49wa.theexpertta.com Home I Student: Megan Montgomery@wsu.e

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12:25 PM iPad 22% ust49wa.theexpertta.com Home I Student: Megan Montgomery@wsu.edu My Account Log out Class Management I Help Homework #4: optical Devices Begin Date: 2/17/2017 1:59:00 PM Due Date: 2/23/2017 11:59:00 PM End Date: 5/8/2017 11:59:00 PM (13%) Problem 8: A pair of binoculars has an angular magnification of 9.5 when acting as a telescope (in most binoculars mirrors are used to make the image upright; we will not consider the effect of these mirrors here). G If the binoculars have objective lenses with a focal length of 13 cm, what is the focal length, fe, of the eyepiece in centimeters? Grade Summary Deductions 0% 100% Potential Submissions cos0 7 8 9 tan Attempts remaining: 20 cotan0 asin() acos0 4 5 6 per attempt) atan() acotan0 sinh() 1 2 3 detailed view cosh0 tanho cotanh0 Degrees O Radians Hint Submit I give up! Hints 0% deduction per hint. Hints remaining: 1 Feedback: 0% deduction per feedback All content 2017 Expert TA, LLC

Explanation / Answer

object focal length fo = 13 cm

angular magnification M = -9.5

angular magnification M = -fo/fe

fe = -M*fo = -*(-9.5)*13

Fe = 123.5

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