Question

If the far point of a myopic person is 75 cm , what should be the ficul length of the lens used to rectify this detect ?

Answer 1

In case of myopia , we use a concave lens to form to form the image of an object on infinity at the far point of the eye.
1/v - 1/u = 1/f
1/u = 1/infinity = 0
So , v=f= -75cm

Answer 2

In case of myopia , we use a concave lens to form to form the image of an object on infinity at the far point of the eye.
1/v - 1/u = 1/f
1/u = 1/infinity = 0
So , v=f= -75cm