Question

Which of the following lens is used as magnifying lens?

• A. Double convex
• B. Double concave
• C. Plano-convex
• D. Plano-concave

Answer 1

The Correct Option is A

A magnifying lens is used to produce a magnified image of an object. To achieve this, the lens must cause rays of light to converge, forming a virtual, erect, and enlarged image when the object is placed within the focal length of the lens. 

This behavior is exhibited by a convex lens, which is a converging lens. Out of the given options, both double convex and plano-convex lenses are convex lenses. However, the double convex lens is more commonly used as a magnifying glass because it has curvature on both sides, which increases its converging power. 
 
Concave lenses (like double concave and plano-concave) are diverging lenses and cannot produce magnified virtual images as required for a magnifying lens. 

Answer: Double convex