Question

10. Explain the experiment to find out the focal length of a convex lens. The focal
length of a convex lens is 100 cm. Find its power.
OR
An object is kept at a distance of 30 cm from a diverging lens of focal
length 15 cm. At what distance the image is formed from the lens? Find the
magnification of the image.
​

Answer 1

Answer:

can be found by obtaining a sharp image of the Sun or a distant tree on a screen, say a plane wall, or a sheet of paper placed on the other side of the lens and measuring the distance between the lens and the image with a scale. This distance is a rough estimate of the focal length, f of the convex lens.

Answer 2

:

10 https://byjus.com/physics/determination-of-focal-length-of-concave-mirror-and-convex-lens/

if the focal length is 100 cm then the power will be equal to one by focal length that is

1÷f

then the power of the lens will be 0.01 diopter

or.

the sum is attached below

I think this is correct

Explanation:

you can get the answer from this link