Question

a) The aim of experiment is to find the focal length of convex lens,write the required material, steps of procedure and observation.​

Answer 1

Explanation:

Ask a friend to spray hair-spray or air-refreshener in the other vicinity of the lens as the lasers. You will see the laser beams tracing their parallel beams and converging to a point. Measure the distance between the point of convergence and the lens. That will be your FOCAL length.

Answer 2

Answer:

you can find this activity in pg 177 of 10 NCERT Science book.