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Q.

A converging lens is held close to the eyes and acts as a magnifying glass. The above statement states for a greater magnifying power the focal length of a convex lens should be


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a

Smaller

b

greater

c

Zero

d

None of the above 

answer is A.

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Detailed Solution

A converging lens is held close to the eyes and acts as a magnifying glass. The above statement states for a greater magnifying power, the focal length of a convex lens should be smaller.
We know that a convex lens is also called a converging lens, and all the incident rays converge at F (Principal focus). When a convex lens is held closer to the eyes, the focal length of the objects becomes minimal. The object here lies between F and C. Therefore, the smaller the focal length, the greater the magnifying power.
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