Question

A diminished image of an object is to be obtained on a large screen $1$m from it. This can be achieved by:

• A. Using a convex mirror of focal length less than $0.25$m
• B. Using a concave mirror of focal length less than $0.25$m
• C. Using a convex lens of focal length less than $0.25$m
• D. Using a concave lens of focal length than $0.25$m

Answer 1

The correct option is C Using a convex lens of focal length less than $0.25$m

For an object's image to have reduced size and to be obtained a screen the image needs to be real and must have a negative magnification. This can only be achieved in case when we have a convex lens and the object placed beyond the center. The correct answer is therefore option (C).