Answer to Question #65120 in Optics for anjani

Question

how do u find the focal length of lens expirementally

Answer 1

The distance from the lens to the focal point is called the focal length, and considered negative in the case of a negative lens. If you select a lens by clicking it, the focal points are indicated by white dots at the focal length on either side of the lens. You can drag the focal point with the mouse to see the effect of changing the focal length.