Determine the focal length of a convex lens required to achieve a magnifying power of…

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

Problem

Determine the focal length of a convex lens required to achieve a magnifying power of 9 when the eye views with the final image at the near point

D=25\,\text{cm}

. (a)

2.8\,\text{cm}

(b)

2.5\,\text{cm}

(c)

3.1\,\text{cm}

(d)

3.9\,\text{cm}