Question: An aging physics professor discovers that he can see objects clearly only between 0.75 m and 2.5 m so he decides he needs bifocals. The

An aging physics professor discovers that he can see objects clearly only between 0.75 m and 2.5 m so he decides he needs bifocals. The upper part of the lens allows him to see objects clearly at infinity, and the lower part allows him to see objects clearly at 25 cm. Assume that the lens is 2 cm from his eye.

(a) Calculate the power of the lens required for the upper part of his bifocals.

(b) Calculate the power of the lens required for the lower part of his bifocals.

(c) Is there a range of distance over which he cannot see objects clearly no matter which part of the bifocals he looks through? If so, what is that range?

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