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Question : 4
Total: 11
What is meant by power of a lens ? What does its sign (+ve or -ve) indicate? State its S.I. unit. How is this unit related to focal length of a lens?
Solution:
The ability of lens to converge or diverge the light rays is called its power.
The positive sign is for converging lens or a convex lens. The negative sign is for diverging lens or a concave lens. The S.I. unit of power is dioptre.
Power =
The positive sign is for converging lens or a convex lens. The negative sign is for diverging lens or a concave lens. The S.I. unit of power is dioptre.
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