If the magnification of a virtual image formed of an object 10cm from a convex lens is 3, then the focal length of the lens is
JAMB 1980 If the magnification of a virtual image formed of an object 10cm from a convex lens is 3, then the focal length of the lens is A. 10cm B. 15cm C. 16cm D. 19cm E. 20cm Correct Answer: Option B Explanation V = 3u, U = 10cm V […]
