A person can see objects clearly from a distance 10cm to infinity.Then we can say that the person 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.

A Person who can see objects clearly at a distance of 10cm, required spectacles to be able ot see clearly objects at a distance of 30cm. What types of spectacle should he use? Find the focal length of the lens.

If a person can sees clearly at a distance of 100 cm, then find the power of leris used to see object at 40 cm.

If a person can sees clearly at a distance of 100 cm, then find the power of leris used to see object at 40 cm.

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