Engineers (optics/EM), Schuttler/Abate, Spring 2018 Main Menu Contents Grades Sy

Question

Engineers (optics/EM), Schuttler/Abate, Spring 2018 Main Menu Contents Grades Syllabus Course Contents Problem Set Timer Notes Evaluate Feedback Print Info Without glasses, your uncle Albert can see things clearly only if they are between 25.9 cm and 150 cm from his eyes. What power eyeglass lens will correct your uncle's myopia? Assume the lenses will sit 2.11 cm from his eyes. Give answer in diopters. Do not enter unit -6.77x10-1 You are correct. Your receipt no. is 166-3644 Previous Tries What is your uncle's near point when wearing these glasses? 17.66cm Submit Answer Previous Tries Incorrect. Tries 6/64 Post Discussion Send Feedback

Explanation / Answer

given that :

1/f = - 0.677

di = image distane = near point - distance between eye and glasses = - (0.259 - 0.02) = - 0.239 m

do = object distance = ?

using the equation

1/f = 1/di + 1/do

- 0.677 = 1/(- 0.239) + 1/do

do = 0.285 m = 28.5 cm

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