Question

The far point of a myopic person is 80 cm in front of the eye. What is the nature and power of the lens required to correct the problem?

Answer 1

the person needs a concave lens of focal length 

f= -80 cm 
Power = 100/f = 100/-80 = -1.25D 

Answer 2

The given condition is that a far point of the myopic individual is roughly about 80 cm in the front of eye.

Due to this, the person requires the concave lens of the focal length.

The calculation of power is given below. The value of focal length f is -80 cm.  

The power P is equals to 100/f.

The power of the lens required to correct the problem is -1.25D.