An object is placed at the focus of concave lens having focal length f . What is the magnification and distance of the image from the optical centre of the lens?

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1 F = 1 v - 1 u Put u = - f and F = - f 1 - f = 1 v - 1 - f ; - 1 f = 1 f - 1 v ; - 2 f = 1 v ⇒ v = - f 2 Magnification = v / u = - f 2 ( - f ) = 1 2

Physics - Geometrical Optics Question with Solution | TestHub

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