Question

Explain auxillary method of determining focal length of a convex lens.??

Answer 1

expose the convex lens to Sun and take a paper and place it at the back of the lens.at one particular point we will get clear sharp point image...measure the distance and that is focal length of coves lens

Answer 2

Answer:

expose the convex lens to Sun and take a paper and place it at the back of the lens.at one particular point we will get clear sharp point image...measure the distance and that is focal length of coves lens