Which of the following lenses would you prefer to use while reading small letters found in a dictionary?

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Convex lens of

f = 50 cm

Concave lens of

f = 50 cm

Convex lens of

f = 5 cm

Concave lens of

f = 5 cm

answer is C.

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Detailed Solution

Convex lens of focal length

5 cm

is preferring to read the small letter in the dictionary.
It is known that a convex lens is a converging lens due to which it converges all the light rays and forms a magnified image. On the other hand, a concave lens is a diverging lens that diverges all the light rays and forms a diminished image. Hence, a convex lens is preferred while reading the small letters found in a dictionary to create an enlarged image. Also, it is known that the power of the lens is inversely proportional to the focal length of the lens. Hence, a convex lens of a lesser focal length will have greater power. Therefore, a convex lens of

f = 5 cm

is preferable.

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