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Human Eye And Colourful World

Question 5:

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?

Answer:

For distant vision = −0.181 m, for near vision = 0.667 m

The power P of a lens of focal length f is given by the relation

(i) Power of the lens us...

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