A student wants a magnifying power of 10 with a simple magnifier when the final image…

PHYSICS · Single correct · CBSE · Physics · Ray Optics and Optical Instruments · Ray Optics and Optical Instruments

Problem

A student wants a magnifying power of 10 with a simple magnifier when the final image is at infinity and his near point is

25\,\text{cm}

. The focal length of the lens he should choose is closest to (a)

0.25\,\text{cm}

(b)

12.5\,\text{cm}

(c)

2.5\,\text{cm}

(d)

2.78\,\text{cm}