1.

How can you decide the focal length of the lens to be used to correct myopia ?

Answer»

Solution :Let the OBJECT DISTANCE (u) is infinity and image distance (v) is equal to distance of far point `u = -oo,v` = distance of far point = -D
Let 'F' be the focal length of bi-concave LENS.
Using lens formula ,` 1/f =1/v -1/u implies1/f =1/(-D) impliesf=-D`
Here 'f' is negative for a concave lens.


Discussion

No Comment Found

Related InterviewSolutions