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Q.

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


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a

Convex lens of f = 50cm

b

Concave lens of f = 50cm

c

Convex lens of f = 5 cm

d

Concave lens of f = 5 cm 

answer is C.

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Detailed Solution

Convex lens of  f = 5 cm is used while reading small letters found in a dictionary.
The magnifying glass is a convex lens used to produce an object's magnified image. The power of the lens is reciprocal to the lens's focal length in meters. Therefore magnification is more for the convex lens when it has a less focal length. So, a convex lens with a focal length of 5 cm is preferred while reading a dictionary.
 
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