Question

An elderly sailor is shipwrecked on a desert island but manages to save his eyeglasses. The lens for one eye has a power of +1.12 diopters, and the other lens has a power of +9.48 diopters. What is the magnifying power of the telescope he can construct with these lenses? Tries تسليم الجواب 0 / 99 How far apart are the lenses when the telescope is adjusted for minimum eyestrain? Tries | تسليم الجواب 0 / 99

Answer 1

Focal length of objective lens, fo = 1/1.12 = 0.893 m

Focal length of eyepiece lens, fe = 1/9.48 = 0.105 m

A)

Magnifying power, P = fo/fe = 8.47

B)

Length, L = fo + fe = 0.998 m

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