MasteringPhysics: Ch22 Problems-Internet Explorer https://session.masteringp Ch2

Question

MasteringPhysics: Ch22 Problems-Internet Explorer https://session.masteringp Ch22 Problems roblem 22.54 tProblemID-93227599 temView 14 of 20> Constants Part A A woman who produces sharp images on her retina only of objects that lie from 100 to 250 cm from her eyes needs bifocal lenses. Determine the desired power of the upper half of the glasses used to see distant objects Express your answer using two significant figures. diopters Submit Part B Determine the power of the lower half used to read a book held 30 cm from her eyes MSUNG

Explanation / Answer

(A) for very far object.

1/p = 0

and q = -250 cm = -2.50 m

1/f = 1/p + 1/q

1/f = 1/q = -0.40 D

(B) p = 30 cm = 0.30 m

q = -100 cm = -1 m

1/f = 1/p + 1/q

1/f = 1/0.30 - 1

1/f = 2.33

P = 1/f = +2.33 D

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