A person can not see the objects clearly placed at a distance more than 40 cm . He is advised to use a lens of power

A person cannot clearly see distance more than 40 cm. He is advised to use lens of power.

A person cannot see the objects distinctly, when placed at a distance less than 100 cm . What is the power of the spectacles that he should use to see clearly the objects placed at 25 cm ?

A person cannot see the objects distinctly, when placed at a distance less than 100 cm . What is the power of the spectacles that he should use to see clearly, the objects placed at 25 cm ?

A person cannot see the object distinctly, when placed at a distance less than 100 cm. What is the power of the spectacles that he should use to see clearly the objects placed at 25 cm ?

A far sighted person cannot see object clearly al a distance less than 75 cm from his eyes. The power of the lens needed to read an object al 25 cm is

A far sighted person cannot see object clearly al a distance less than 75 cm from his eyes. The power of the lens needed to read an object al 25 cm is

A person who can see objects clearly at a distance of 10cm , requires spectacles to be able to see clearly objects at a distance of 30 cm. what type of spectacle should he use? Find the focal length of the lens.