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
1-) SPARKLING VISION OF A TEST TUBE PARTIALLY FILLED WITH WATER : Rays of light fall on the test tube where there is no water and gets ref...
The phenomenon of interference and diffraction have proved beyond any doubt that light is some from of wave motion. But these properties o...
The eye is the organ that allows us to see the world around us. It is perhaps the most wonderful and perfect optical instrument. Without e...
No comments:
Post a Comment