Question

Name the eye defect in which eye lens become cloudy on milky. Name the method for its correction. A person uses a lens of power -2.0 D for correcting his distant vision and for his near vision he used lens of power +2.0D. Calculate the focal length of lenses required to correct these defects.

Answer 1

The defect of vision in which the eye lens becomes milkey and cloudy is Cataract. it can be corrected by surgery.

For Correcting the distant vision powerof the lens isP=  -2D

we know that P=1/f  or f=1/P

f=1/-2     f=-0.5m      f=-50cm

so the focal length of the lens required to correct the distant vision is   f= -50cm

For correcting the near vision power of the lens is  P=+2D

f=1/P    f=1/+2       f=+0.5m      f=+50cm

So the focal length ofthe lens required to correct the near vision is f=+50cm

Answer 2

Answer:

catract is your answer