Any transparent refracting medium bounded by two surfaces ( in which at least one surface should be curved surface)is called a "lens". The lenses used in laboratory are generally made up off glass. There are two type of lenses :
1-) Convex lenses : These lenses are thicker at the centre and thinner at their edges. These are also called converging lenses. There are three type of convex lens :
a-) Double convex or biconvex
b-) Plano-convex
c-) Concavo-convex
2-) Concave lenses : These lenses are thinner at the centre than at edges. A concave lens is also called as diverging lens. There are three type of concave lenses :
a-) Double concave or biconcave
b-) Plano-concave
c-) convexo-concave
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The phenomenon of interference and diffraction have proved beyond any doubt that light is some from of wave motion. But these properties o...
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