To find the focal length of a convex lens in a laboratory, Aman fixed it on a stand and kept - Science - Light - Reflection and Refraction

Question

To find the focal length of a convex lens in a laboratory,
Aman fixed it on a stand and kept it on a mark of 15 3cm on an
optical bench To get a clear image of a distant tree, he adjusted a
screen and finally got the clear image when the screen was placed
at 32 5cm Then Focal length of the lens is

Aayushi Pandey · Answer

focal length = distance b/w the lens and the screen
focal length = 32 5 cm - 15 3 cm
= 17 2cm
hence the focal length of the lens is 17 2 cm