A person needs a lens of power –5.5 dioptres for correcting his distant 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) distant vision, and (ii) near vision?

NCERT Class X
Science - Science

Chapter _The Human Eye and the Colourful World

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Answers

2015-06-24T22:06:09+05:30
For distant vision 0.18 m focal length of concave lens
for near vision 0.67 m focal length of convex lens
p=1/f

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