A man can see only between `75 cm` and `200 cm` . The power of lens to correct the near point will be

A man can see the object between 15 cm and 30 cm . He uses the lens to see the far objects. Then due to the lens to see the far objects. Then due to the lens used, the near point will be at

A person can not see objects beyond 50cm .The power of a lens to correct this vision will be

a man can see upto 100cm of the distant object. The power of the lens required to see far objects will be: