Amazing Lens Makers Equation
The derivation of lens maker formula is provided here so that aspirants can understand the concept more effectively.
Lens makers equation. The radius R 2 is negative since it extends left from the second surface. For a thin lens the power is approximately the sum of the surface powers. A lens having at least one convex surface such that light passing through it may be brought to a focus.
Lets derive the famous lens makers formula. Here ยต is refractive index of lens material to the medium outside. Lens Maker Formula Derivation.
The Lens Makers Formula. The power of a lens is given by the equation latextextPfrac1textflatex. Lenses of different focal lengths are used for different optical instruments.
The calculator also determines the lens. Remember that K shape represents the shape of the lens which remains constant. Created by Mahesh Shenoy.
The following assumptions are taken for the derivation of lens maker formula. The radii of curvature here are measured according to the Cartesian sign conventionFor a double convex lens the radius R 1 is positive since it is measured from the front surface and extends right to the center of curvature. If the lens were much fatter then the distance from the centre to the predicted focal point would be inside the lens and therefore not valid.
Lens manufacturers use the lens makers formula to manufacture lenses of the desired focal length. The lens-makers equation applies to a lens immersed in a liquid if n in the equation is replaced by n2n1. Learn lens makers formula.