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INTRODUCTION: Investment is the commitment of money or capital to purchase financial instruments or other assets in order to gain profitable returns in form of interest, income, or appreciation of the value of the instrument. It is related to saving or deferring consumption.

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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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