Howtosignalprocessing
It 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.
- How do you determine the focal length of a lens experimentally?
- How do you find the focal length of a lens?
How do you determine the focal length of a lens experimentally?
To determine focal length of a convex lens
Place the holder with the screen on the bench. The position of the screen should be such that the sharp image of the distant object is obtained on it. The difference between the position of the lens and the screen is equal to the focal length of the given convex lens.
How do you find the focal length of a lens?
The typical focal length formula looks as follows: 1/Focal length = 1/Image distance + 1/Object distance , where: Image distance and Object distance are given in mm.
