Question

To find the focal length of a convex lens by plotting graphs between u and v or between 1/u and 1/v with reading

Answer 1

Apparatus:

An optical bench with three uprights (central upright fixed, two outer uprights with lateral movement), a convex lens with lens holder, two optical needles, (one thin, one thick) a knitting needle and a half metre scale

Theory:

The relation between u, v and f for a convex lens is

f = uv/ v-u