1.

A person is not able to read from a book until he keeps it at 50 cm. Determine the power of corrective lens.

Answer» SINCE the PERSON is able to read clearly from a distance of 50 CM
focal length REQUIRED = 50 cm = 0.5m

Power = \frac{1}{f}= \frac{1}{0.5}=<klux>2D</klux>

Power of corrective lens is 2D.


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