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Problem Faced by Surface Based Telescope and Telescopes in Space

A lens having...

Question

A lens having two spherical surfaces bulging outward is called ______________.

A

concave lens

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B

convex lens

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C

plano-convex lens

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D

plano-concave lens

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Solution

The correct option is B
convex lens

A lens having both the spherical surfaces bulging outwards is called a convex lens and a lens having both the spherical surfaces curved inwards is called a concave lens.

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Q. A concave lens has two spherical surfaces bulging inward.

Q. Why is a convex lens called a converging lens and a concave lens called a diverging lens?

Q. The word "KVPY" is written on a board and viewed through different lenses such that board is at a distance beyond the focal length of the lens. Ignoring magnification effects, consider the following statements.
(I) Image (i) has been viewed from the planar side of a plano-concave lens and image (ii) from the planar side of a plano-convex lens.
(II) Image (i) has been viewed from the concave side of a plano-concave lens and image(ii) from the convex side of a plano-convex lens.
(III) Image(i) has been viewed from the concave side of a plano-concave lens and image (ii) from the planar side of a plano-convex lens.
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Q. A Plano convex lens fits exactly into a Plano concave lens. Their plane surfaces are parallel to each other. The lenses are made of different materials of refractive indices

(μ_{1})

of Plano convex lens and

(μ_{2})

of Plano concave lens.

R

is the radius of curvature of the curved surface of the lenses. Then the focal length of the combination is -

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Problem Faced by Surface Based Telescope and Telescopes in Space

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