Question

(v) Sumati bought not-so-thick lenses for the telescope and polished them. What

advantages, if any, would she have with her choice of lenses?

a) She will not have any advantage as even thicker lenses would give

clearer images.

b) Thicker lenses would have made the telescope easier to handle.

c) Not-so-thick lenses would not make the telescope very heavy and also

allow considerable amount of light to pass.

d) Not-so-thick lenses will give her more magnification.​

Answer 1

Answer:

option (d) is correct

Explanation:

Answer 2

Correct answer is (C) Not-so-thick lenses would not make the telescope very heavy and also allow a considerable amount of light to pass.

• It is indeed true that not-so-thick lenses for a telescope add a degree of advantage.
• Because it has more curvature or a shorter focal length, a thick convex lens has more power than a thin convex lens.
• Thin convex lenses have more curvature or a shorter focal length than thick convex lenses, which have less curvature or a longer focal length.
• The focal length of a lens is known to be inversely proportional to its power.
• As a result, a shorter focal length lens will have more power or a higher refraction (causing more bending of light rays).
• A lens with a longer focal length will have less power or low refraction (causes less bending of light rays).
• As a result of he shorter focal length, a thick convex lens has more power.

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