a lens formula tell mee ........
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A lens formula may be defined as the formula which gives the relationship between the distance of image (v), distance of object (u), and the focal length (f) of the lens. It may be written as: Where, v = Distance of image from optical centre of lens.
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The thin lens equation quickly provides the relation between di, do, and the focal length f. It can be derived from a geometric analysis of ray tracing for thin lenses and is given by 1do+1di=1f 1 d o + 1 d i = 1 f . The magnification m of an image is the ratio between the image and object height (hi/ho).
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