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State two differences between a convex and a concave lens.
Convex Lens:
The lens converges a beam of light after passing through it. Its upper and lower edges are thin and the middle part is thick. A convex lens is also said to be a converging lens as it converges the light rays.
Concave Lens:
A lens that diverges after a beam of light passes through it. Its outer surface is bent inward. A concave lens is also said to be a diverging lens as light rays get diverged after passing through a concave lens.
Difference Between Convex and Concave Lens:
| Convex Lens | Concave lens |
| A convex lens has thin edges with a thick center. | A concave lens has thick edges with a thin center. |
| A convex lens is called a positive lens because of a positive focus distance. | A concave lens is called a negative lens because of a negative focus distance. |
| A convex lens is used to correct far-sightedness. | To cure short-sightedness, a concave lens is used. |
| A convex lens is converging in nature. | A concave lens is diverging in nature. |
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Updated on: 10-Oct-2022
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