Question

Q28. What is meant by power of a lens? Define its S.I. unit. You have two lenses A and B of focal lengths + 10cm and
- 20 cm respectively. State the nature and power of each lens.​

Answer 1

Answer:

Power of the lense is the ability of the lense to converge the rays of the light falling on it. It is to remember that focal length of convex lens are positive & focal length of concave lens are negative. And convex lens will form virtual & magnified image when object is in b/w focus & pole of lens.