Consider two lenses A and B of focal length f 1 and f 2 placed in contact with each other. Combination of Lenses Drive an expression for equ... physics Drive an expression for equivalent focal length of two thin lenses kept in contact. A single lens, which will form the image of a given object at the same point as is formed by the component lenses (combination of two or more lenses), is called an equivalent lens. Let this central point is 1. . What is the power of the lenses in diopters? Consider that two thin lenses L 1 and L 2 of focal lengths f 1 and f 2 are placed in contact with each other. Consider the thick bi-convex lens shown in Figure \(\PageIndex{8}\). What is altered when we put two thin lenses in contact instead of the usual, just 1? The image of point object O will be at I 1 formed by lens A, which act as a virtual object for second lens B producing the final image at I. since lenses are thin, therefore we assume the optical centres of the lenses to be coincident. Combination of Thin Lenses The image of an object can be made erect and much magnified by using more than one lenses. When they are 0.25 m apart the power is reduced to +6 diopters. Two thin lenses having optical powers of $$-10D$$ and $$+6D$$ are placed in contact with each other. A point object O is placed on the principal axis at distance u from the lens L 1. Combination of thin lenses in contact Let us consider two lenses A and B of focal length f 1 and f 2 placed in contact with each other. These equations, called the thin-lens equation and the lens maker’s equation, allow us to quantitatively analyze thin lenses. Combination of Thin Lenses Consider two thin convex lenses L 1 and L 2 of focal length f 1 and F 2 placed coaxially in contact with each other. Two thin lenses when in contact produce a combination of power +10 dioptres. The index of refraction of the surrounding medium is n 1 (if the lens is in air, then \(n_1=1.00\)) and that of the lens is \(n_2\). 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