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1. Real image is an image that can be formed on a screen whereas a virtual image is an image that cannot be formed on a screen.Convex lensConcave lens2. Construction rules for concave lensConvex lensConcave lens3. Images formed by a convex lensu = u > 2fu = 2f f < u < 2fu = fu < f4. Images formed by a concave lensGreater than fLess than f5. Linear Magnification, MReal ImageVirtual imageFormula;hi = height of imageho = height of objectv = image distanceu = object distance6. Lens Equation u = objectv = imagef = LensObjectuReal+Virtual 7. Power, PPower of a lens is the reciprocal of the focal length of the lens (in metre). Its unit is diopter (D).A convex lens has a positive power of lens whereas a concave lens has a negative power of lens. 8. Application of lenses:(a) A convex lens is a simple magnifier when the object distance is less than the focal length of the lens.(b) A compound microscope consists of two convex lenses called the objective lens and the eyepiece.(c) An astronomical telescope consists of two convex le

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