Question

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 1

Answer: (C)

A convex lens of focal length 5 cm.

Answer 2

A convex mirror always gives a virtual and erect image of smaller size of the object placed in front of it. Similarly, a plane mirror will always give a virtual and erect image of same size as that of the object placed in front of it. Therefore, the given mirror could be either plane or convex.