Check sibling questions

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

(a) A convex lens of focal length 50 cm.

(b) A concave lens of focal length 50 cm.

(c) A convex lens of focal length 5 cm.

(d) A concave lens of focal length 5 cm.

 

Answer

Answer is (c) A convex lens of focal length 5 cm.

 

Explanation 

A concave lens will always give a diminished image.

So, we use a convex lens as it makes an enlarged image

 

Now, the smaller the focal length, the greater will be the power of the lens.

 

Hence, a convex lens of focal length 5cm will be preferable.

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CA Maninder Singh

CA Maninder Singh is a Chartered Accountant for the past 12 years and a teacher from the past 16 years. He teaches Science, Accounts and English at Teachoo