state and explain the lens formula
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The lens equation allows us to understand geometric optic in a quantitative way where 1/d0 + 1/di = 1/f. The lens equation essentially states that the magnification of the object = - distance of the image over distance of the object.
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Answer: The lens formula is a mathematical relation between the object distance u, image distance v and focal length f of a spherical lens. This formula is applicable to both convex and concave lenses. An object 5.0 cm in length is placed at a distance of 20 cm in front of a convex mirror of radius of curvature 30 cm.
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