Question

How do you find the focal length of a. lens experimentally​

Answer 1

Answer:

i) Place the convex lens on a 'V' stand. . ii) Light a candle and take it far away from the lens along the principal axis. iii) Adjust the screen on the other side of the lens to get a clear image on it. iv) Measure the distance between the 'V' stand and the screen which gives a rough idea of focal length of the lens.

Answer 2

Explanation:

i) Place the convex lens on a 'V' stand.

ii) Light a candle and take it far away from the lens along the principal axis.

iii) Adjust the screen on the other side of the lens to get a clear image on it.

iv) Measure the distance between the 'V' stand and the screen which gives a rough idea of focal length of the lens.