Question

The lens used to read small letters in a dictionary is 
1. convex lens of focal length 50 cm
2. concave lens of focal length 50 cm
3. convex lens of focal length 5 cm
4. concave lens of focal length 5cm​

Answer 1

Answer:

• Correct option is 4. concave lens of focal length 5cm

Explanation:

A convex lens is also used as a simple microscope. The object is kept between the focal length and mirror so that a virtual, erect and magnified image is formed. Smaller focal length has more power and is suitable for larger magnification. Hence, convex lens of focal length 5 cm is preferred.

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