The central part of a convex lens is thicker than the edges. Because of its converging nature, this lens is called a converging lens. When light enters the lens, it undergoes refraction and eventually converges at a point known as the main focus, or F. The focal length is the distance between the primary focus and the lens’s centre. The power of the length is the reciprocal of the focal length. It is measured in diopters. The displacement technique of length is used to determine the focal length and power of a thin convex lens.
The distance between an object and a screen is 100cm. A lens produces an image on the screen when the lens is placed at either of the positions 40cm apart. The power of the lens is nearly
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Principal, Babu Daudayal SVM, Mathura