What is Focus in Physics?
In 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 Radius?
Focal Length of Concave Lens given Radius calculator uses Focal Length of Concave Lens = -Radius/2 to calculate the Focal Length of Concave Lens, Focal length of Concave Lens given Radius is the distance of focus from the pole of the lens. Focal Length of Concave Lens is denoted by Fconcave lens symbol.
How to calculate Focal Length of Concave Lens given Radius using this online calculator? To use this online calculator for Focal Length of Concave Lens given Radius, enter Radius (rcurve) and hit the calculate button. Here is how the Focal Length of Concave Lens given Radius calculation can be explained with given input values -> -4.5 = -9/2.