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Convex Lens

If there is a...

Question

If there is a convex lens which is made of material whose optical density is less than that of air, then it would be a converging lens.

A

True

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B

False

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Solution

The correct option is B
False

As the substance is optically rarer as compared to air, when light travels from air to the lens, it will move away from the normal. Therefore, the lens will act as a diverging lens.

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Q. A lens that has convex surface at one side and concave surface at another side behaves as :

a) convergent lens when the radius of curvature of convex surface is greater than that of concave surface.
b) divergent lens when the radius of curvature of concave surface is greater than that of convex surface.
c) convergent lens when the radius of curvature of convex surface is less than that of concave.
d) divergent lens when the radius of curvature of concave surface is less than that of convex surface.

Q. A lens is a piece of transparent material with two refracting surfaces such that at least one is curved and refractive index of its material is different from that of the surroundings.
A thin spherical lens with refractive index greater than that of surroundings behaves as a convergent or convex lens, i.e., converges parallel rays if its central (i.e., paraxial) portion is thicker than marginal one.
However if the central portion of a lens is thinner than marginal, it diverges parallel rays and behaves as divergent or concave lens. show this and classify identify convergent and divergent lenses.

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