Lens And Its Types
Lens And Its Types
A lens is a piece of transparent material with two refracting surfaces such that at least one is curved and the material of lens is different from that of the surroundings.
Convex lens:
A thin spherical lens which is thicker at the middle than the edges behaves as a convergent or convex lens i.e. it converges parallel rays. Depending on the type of two surfaces they can be further classified as:
1. Double Convex Lens: When both the refracting surfaces are convex surfaces. It is called double convex lens.
2. Plano - Convex Lens: When one of the refracting surface is plane and the other refracting surfaces is convex surfaces. It is called plano - convex lens.
3. Concavo Convex Lens: When one of the refracting surface is a concave surface and the other refracting surfaces is convex surfaces. It is called concavo convex lens.
Concave lens:
If the central portion of a lens is thinner than marginal, it diverges parallel rays and behaves as a divergent or a concave lens.
1. Double Concave Lens: When both the refracting surfaces are concave surfaces. It is called double concave lens.
2. Plano - Concave Lens: When one of the refracting surface is plane and the other refracting surfaces is concave surfaces. It is called plano - concave lens.
3. Convexo Concave Lens: When one of the refracting surface is a concave surface and the other refracting surfaces is convex surfaces. It is called convexo concave lens.
A convex lens is ____________________ . | |||
| Right Option : B | |||
| View Explanation | |||
When one of the refracting surface of a lens is plane and the other refracting surfaces is concave surfaces. It is called ____________________ . | |||
| Right Option : A | |||
| View Explanation | |||
Which of the following are correct ? (a) When one of the refracting surface is a concave surface and the other refracting surfaces is convex surfaces. It is called Plano convex lens . (b) If the central portion of a lens is thinner than marginal, it diverges parallel rays and behaves as a divergent or a concave lens. (c) When both the refracting surfaces are concave surfaces. It is called double concave lens. | |||
| Right Option : B | |||
| View Explanation | |||
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