Physics

Problem

For a simple magnifier adjusted so that the final image is formed at the least distance of distinct vision

D

, which of the following gives its magnifying power

m

in terms of its focal length

f

? a)

m = 1 + \dfrac{f}{D}

m = \dfrac{D}{f}

m = 1 + \dfrac{D}{f}

m = \dfrac{D}{f} - 1