Powers Of A Lens

[ChipSkylark3220]

Suppose you notice that a friend is having difficulty seeing distant objects clearly. After a few tests, you and your friend discover that they can see objects clearly out to about 35 cm from their eyes. Being a good friend, you want to help your friend see far away objects clearly. What should the focal length of a lens be to allow your friend to see a very far away object clearly, assuming the lens is placed 2 cm from your friend’s eye? What would the power of the lens be in diopters?

For distance object I got 0.35m and image distance I got 0.02m. I used 1/v +1/u = 1/f to get f=0.02 m and lens power of 52.86m. Is this correct?

[Boto]

Perhaps a trip to an optician is indicated.

[Rev. Green]

A -2.75 diopter lens would help (-1/0.35).