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32% Mon 5:15 PM Q E 03 Safar Ed View History Bookmarks Develop Window Help File O O O HW11. ponses /submit?dep 91750994 Q4 Reade gn.ne Apple Disney ESPN Yahoo! The Near Point of A Pers Telescope Can Be Used A... SunGard Higher Education question I Chegg.com Certain Child's Near Poi HW11. 5. C+ -4 points SerCP9 25.P.012.W My Notes A certain child's near point is 12.5 cm; her far point (with eyes relaxed) is 133 cm. Each eye lens is 2.00 cm from the retina. (a) Between what limits does the power of this lens-cornea combination vary? diopters (lower bound) to diopters (upper bound) (b) Calculate the power of the eyeglass lens the child should use for relaxed distance vision. Is the lens converging or diverging? diopters, and the lens is Lens Type Need Help? Read It Watch It Chat About It it Answer Save Progress Practice Another Version 6. C+ -2 points SerCP9 25.P.021.W My Notes A biology student uses a simple magnifier to examine the structural features of an insect's wing. The wing is held 3.25 cm in front of the lens, and the image is formed 22.0 cm from the eye. (a) What is the focal length of the lens? Cm (b) What angular magnification is achieved? Need Help? Read It Watch It Chat About It

Explanation / Answer

A. a) lower bound is (1/0.02m)+(1/1.33) = 50.75

And for High bound: (1/0.02m) + (1/0.125m) = 58

b) power of the eyeglasses is :

(1/-1.33m) = -0.75
virtual image so negative. If focal length is negative then it is diverging.

B. 1 /f = 1 / u + 1 /v
1 /f = 1/3.25 + 1/ 22
f = 2.832
f = 2.83 cm

Magnification = v / u = 22/3.25 = 6.76
M = 6.76 times

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