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Which one of the following lenses would you prefer to use while readin

June 1, 2025 by rawan239

Which one of the following lenses would you prefer to use while reading very small letters printed on a label ?

Convex lens of large focal length

Concave lens of large focal length

Convex lens of small focal length

Concave lens of small focal length

This question was previously asked in

UPSC CAPF – 2009

Download PDF Attempt Online

A Convex lens of small focal length is preferred for reading very small letters printed on a label.

To read small letters, a magnifying glass is used. A magnifying glass is a convex lens. A convex lens forms a magnified, virtual, and erect image when the object is placed within its focal length. The magnification power of a simple magnifying glass is given by M = 1 + (D/f), where D is the least distance of distinct vision (approx. 25 cm) and f is the focal length of the lens. To achieve higher magnification, the focal length (f) must be smaller.

A concave lens is a diverging lens and produces reduced or same-size images (virtual and erect or real and inverted), not magnified images for viewing small objects directly. A convex lens of large focal length will produce less magnification compared to one with a small focal length.

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