Question

In an experiment for determination of the focal length of a thin convex lens, the distance of the object from the lens is 10 ± 0.1 cm and the distance of its real image from the lens is 20 ± 0.2 cm. The error in the determination of focal length of the lens is n%. The value of n is _____.

Answer 1

Object distance = 10 ± 0.1 cm

Image distance = 20 ± 0.2 cm

Applying lens formula