What is Optical Focus ?
n geometrical optics, a focus, also called an image point, is the point where light rays originating from a point on the object converge. ... A principal focus or focal point is a special focus: For a lens, or a spherical or parabolic mirror, it is a point onto which collimated light parallel to the axis is focused.
How to Calculate Focal Length of Concave Lens given Image and Object Distance?
Focal Length of Concave Lens given Image and Object Distance calculator uses Focal Length of Concave Lens = (Object Distance*Image Distance)/(Image Distance-Object Distance) to calculate the Focal Length of Concave Lens, Focal length of Concave Lens given Image and Object Distance is the distance of the focus from the pole of the lens. It is denoted by f and the SI Unit of focal length is meter. Focal Length of Concave Lens is denoted by Fconcave lens symbol.
How to calculate Focal Length of Concave Lens given Image and Object Distance using this online calculator? To use this online calculator for Focal Length of Concave Lens given Image and Object Distance, enter Object Distance (u) & Image Distance (v) and hit the calculate button. Here is how the Focal Length of Concave Lens given Image and Object Distance calculation can be explained with given input values -> -0.385714 = (0.9*0.27)/(0.27-0.9).