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

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 objects and the bottom half of the lens is used to view objects close to the eye. A person can clearly see objects only if they are located between 40 cm and 198 cm away from his eyes. Bifocal lenses are used to correct his vision. What power lens (in diopters) should be used in the bottom half of the lens to allow him to clearly see objects 25 cm away? Tries 0/20 What power lens (in diopters) should be used in the top half of the lens to allow him to clearly see distant objects?

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Answer #1

Given data The image lens is, q198 cm Using lens formula Since her far point is 198 cm, we need to take objects from in finity and focus them at 198 cm away. Since the images will be on the same side of the lens as the object, it is virtual, and wili need a negative by sign convention, so, ア infinity. (-198) f--197 cm The lens power is the inverse of the focal length, converted to meters 100 (-198) -0.51 D

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