Lens formula derivation.
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Derive the lens formula, 1/ f = 1/v – 1/u for a concave lens, using the necessary ray diagram. ... Let's consider a convex lens and O be the optical centre ; F the principal focus with focal length f. Let, AB be the object held perpendicular to the principal axis at a distance beyond the focal length of the lens.
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In optics, the relationship between the distance of an image (v), the distance of an object (u), and the focal length (f) of the lens is given by the formula known as Lens formula. Lens formula is applicable for convex as well as concave lenses. These lenses have negligible thickness. The formula is as follows:
1/v−1/u=1/f
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