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The lens used to read small letters in a dictionary is  1. convex lens of focal length 50 cm2. concave lens of focal length 50 cm 3. convex lens of focal length 5 cm 4. concave lens of focal length 5cm​

Answer»

Correct OPTION is 4. concave lens of focal length 5cmExplanation: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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