A person needs a lens of power – 5.5 diopters for correcting his distant vision. For correcting his near vision he needs a lens of power + 1.5 diopter. What is the focal length of the lens required for correcting i. distant vision, and ii. Near vision?
focal length, f =
i) For distant vision: focal length, f = = = 0.18 m

ii) For near vision: focal length, f = = = 0.67 m

Question

focal length, f =

i) For distant vision: focal length, f = = = 0.18 m

ii) For near vision: focal length, f = = = 0.67 m

Philoid · Accepted Answer

focal length, f =

i) For distant vision: focal length, f = = = 0.18 m

ii) For near vision: focal length, f = = = 0.67 m