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Question

A person needs a lens of power 5.5 dioptres for correcting his distance vision. For correcting his near vision he needs a lens of power +1.5 dioptre. What is the focal length of the lens required for correcting (i) distance vision, and (ii) near vision?

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Solution

(i) Distant Vision :

Given,

Power =5.5D

Power, P=1f

Focal length, f=1P

f=15.5

f=1055

f=211

f=0.181m

f=18.1cm

(ii) Near Vision :

Given,

Power =1.5D
P=1f

f=1P

f=11.5

f=1015

f=23

f=0.667m

f=66.7cm


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