Question

The maximum distance up to which a man can see distinctly is $200cm$. What lens should he use in order to see far off objects distinctly?

• A. Convex lens of focal length $200cm$
• B. Concave lens of focal length - $200cm$
• C. Convex lens of focal length $100cm$
• D. Concave lens of focal length - $100cm$

Answer 1

The correct option is B Concave lens of focal length - $200cm$

To see far object when our eye can see maximum distance upto 200m. Then we can use concave lens of local length 200m such that the image of far objects will form at focus which will make them visible.