Sometimes a person cannot clearly see objects close up or far away. To correct t

Question

Sometimes a person cannot clearly see objects close up or far away. To correct this type of vision, bifocals are often used. The top half of the lens is used to view distant object* and the bottom half of the lens is used to view objects clone to the eye. A person can clearly see objects only if they are located between 35 cm and 176 cm away from his eyes. Bifocal lenses are used to correct his vision. What power lens-(in diopters) should be used in the top half of the lens to alkiw him to clearly see distant objects? -2 86 -114 -0-57 -0.47 0.47 0 57 1.14 2.86

Explanation / Answer

for the top part, convex lens has to be used. Thus, power = 1/1.76 = 0.57 D The positive sign is taken because convex lens has a positive focal length.

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