Question

A person uses a lens of power -2.0 D for correcting his distant vision and for correcting hi near vision be used lens of power +2.0D calculatethe focal length of lenses required to correct this defect

Answer 1

Hey buddy...
For the first one
P = -2.0D
And we know that,
P= 1/ f
Therefore,
f= 1/ P
= 1/ -2.0 = -0.5m = -0.5 ×100 = -50 cm
This is a concave lens.

Now for the second one
P= 1/ f
f = 1/ P
= 1/ 2.0 = 0.5 m× 100 =50 cm
This is a convex lens.

NOTE:-
Focal length and power of a concave lens is always -ve.
Focal length and power of a convex lens is always +ve.

Hope this helps you..
Plz mark as the BRAINLIEST..

Answer 2

50 cm

Is the answer

Hope it helps