To read a poster on a wall a person with defective vision

Last updated: 6/21/2023

To read a poster on a wall a person with defective vision needs to stand at a distance of 0 4 m from the poster A person with normal vision can read the poster from a distance of 2 0 m Then the lens which can be used to correct his vision is O A concave lens of 1 0 D O A concave lens of 2 0 D O A convex lens of 2 0 D O A concave lens of 0 5 D Marks 4 1