MESSAGE MY INSTRUCTOR FULL SCREEN PRINTER VERSION BACK Chapter 26, Problem 076 G

Question

MESSAGE MY INSTRUCTOR FULL SCREEN PRINTER VERSION BACK Chapter 26, Problem 076 GO Your answer is partially correct. Try again. A woman can read the large print in a newspaper only when it is at a distance of 69 cm or more from her eyes. (a) Is she nearsighted (myopic) or farsighted (hyperopic), and what kind of lens is used in her glasses to correct her eyesight? (b) What should be the refractive power (in diopters) of her glasses (worn 3.0 cm from the eyes), so she can read the newspaper at a distance of 27 cm from the eyes? (a) She is farsighted (b) Number 2.2 Units diopters the tolerance is +/-596 Click if you would like to Show Work for this question: Open Show Work SHOW HINT LINK TO TEXT

Explanation / Answer

(a) far sighted

convex lens

(b)

object distance p = 25-3 = 22 cm

image distance q = -(69-3) = -66 cm

focallength = f

from lens equation

1/p + 1/q = 1/f

1/22 - 1/66 = 1/f

f = 33 cm

power P = 1/f( in meters)

P = 1/(0.33)

P = +3.1 D <<<------answer

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