4. Light Refraction
Spherical Lens Definition :
A piece of a transparent medium bounded by at least one spherical surface, is called a spherical lens. Types :
There are two types of spherical lenses:
(i) Convex or Converging Lenses :
These are thick in the middle and thin at the edges. Fig. Three types of convex lenses
(a) Double Convex Lens :
It has both the surfaces convex.
(b) Plano–Convex Lens :
It has one surface plane and the other surface convex.
(c) Concavo–Convex Lens :
It has one surface concave and the other surface convex.
(ii) Concave or Diverging Lenses :
These are thin in the middle and thick at the edges.
There are three types of concave lenses : Fig. Three types of concave lenses
(a) Double Concave Lens :
It has both the surfaces concave. (Fig.)
(b) Plano–Concave Lens :
It has one surface plane and the other surface concave. (fig.)
(c) Convexo–Concave Lens :
It has one surface convex and the other surface concave. (fig.)
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