Question

introduction of lenses

Answer 1

lenses is a one of the topic in optics....
sir david Brewster developed the field of optics.
lens...
a lense is formed when one medium is separated from another medium by two surfaces,one of which is curved...

types of lenses...
convex lens
concave lens
biconvex lens
bi concave lens
plano concavo lens
plano convexo lens
concave convex lens......

convex lens converges the light rays...
concave lens diverges the light rays....

hope it helps you mark it as brainliest......
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Sravan kumar......
rock star sanu.......

Answer 2

DEFINITION -

Lenses are transparent refracting medium bounded by two curved surfaces which are generally sperical .

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TYPES -

1) convex lens [ () ]
2) concave lens [ )( ]

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CONVEX LENS

the lens bulges out in the middle.

a light beam converges on passing through a convex lens so it is also called a converging lens.

a convex lens may be of the following three types :-
1) bi-convex
2) Plano convex
3) concavo convex

a biconvex lens has both its surface convex .
Plano convex lens has one surface plane and others surface convex .
a concaveo convex lens has one surface convex and the other surface concave such that it is thicker in the middle as compared to the Periphery.

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CONCAVE LENS

lens diverges the light rays incident on it so it is also called the divergent lens

a concave lens maybe of the following three types :-
1)bi concave
2)Plano concave
3)convexo concave

bi concave lens has one of its surface concave
a Plano concave lens has one of its surface plane and the other side face concave
a convexo concave lens has one surface concave and the other surface on which such that it is thinner in the middle and thicker at the Periphery.