Brilliant Derive Lens Maker Formula For Concave Lens
A lens formula may be defined as the formula which gives the relationship between the distance.
Derive lens maker formula for concave lens. Let AB represent an object placed at right angles to the principal axis at a distance greater than the focal length f of the convex lens. The image formation can be seen in two steps the first refracting surface form an image I 1 which act as a virtual object for the second surface. These lenses have negligible thickness.
I Calculate the power of the new lens. CC 1 P 1 C 1 R 1. The combination of a convex lens f 18 cm and a thin concave lens f 9 cm is.
Basic assumptions in derivation of Lens-makers formula. Two lenses of power 10 D and 5 D are placed in contact. Following assumption are considered while deriving lens makers formula for concave lens a only point object is taken b the aperature of the lens is small.
Examples of Lens Formula Derivation. CI 1 P 1 I 1 V 1 as the lens is thin. The lens needs to be thin.
Refraction at X1 P1 Y1 Let O be a point object lying in the rarer medium on. On violation of the limitations then the refraction at the curved surface formula. The image A 1 B 1 is formed between O and F 1 on the same side as the object is kept and the image is erect and virtual.
The medium on either side of the lens needs to be the same. If the focal length is negative it implies that the lens is concave diverging while if positive it implies that the lens is convex converging lenses. The power of the concave lens is told to be negative and the power of the convex lens.