The lens formula is used for both convex and concave lenses . The lens Formula is used for finding the image distance, determining the type of image formed and the focal length of the lens . Learn how to calculate the image distance of an object using the lens formula , which is applicable to both convex and concave lenses. Find out the power, focal length, and diopter of a lens , and see solved examples and FAQs on lens formula . The lens formula establishes the relation between the object, and image distances from the optical center, and the focal length of a lens . Concave Lens : A concave lens diverges the parallel beam of light at the focal point and bends the light rays outward. In optics, the relationship between the distance of the image (v), the distance of the object (u), and the focal length (f) of the lens is given by the formula known as the Lens formula .
