A long-sighted person cannot see objects clearly at a distance less than 40 cm from his eye....

A long-sighted person cannot see objects clearly at a distance less than 40 cm from his eye....

A long-sighted person cannot see objects clearly at a distance less than 40 cm from his eye. The power of the lens needed to read an object at 25 cm is _____. #10th #NSO #HUMANEYEANDCOLOURFULWORLD