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Many optical instruments consist of a nu...

Many optical instruments consist of a number of lenses.They are combined to increase the magnification and sharpness of the image. the net power (P) of the lenses placed in contact is given by the algebraic sum of the powers of the individual lenses `P_1,P_2,P_3....` as
`P=P_1 + P_2 + P_3 ....`.
This is also termed as simple additive property of the power of lens,widely used to design lens system of cameras,microscopes and telescopes.These lens systems can have a combinatio of convex lenses and also concave lenses.
(d) How is a virtual image formed by a covex lens different from that fromed by a concave lens?Under what conditions do a convex and a concave lens form virtual images?

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