Q7 of 14 Page 197

Make a diagram to show how hypermetropia is corrected.

(a) The hyper-metropic correction is shown below by using convex lens correction.


More from this chapter

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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 dioptres. What is the focal length of the lens required for correcting


(i) distant vision, and


(ii) near vision?

 6

The far point of a myopic person is 80 cm in front of the eye. What is the nature and power of the lens required to correct the problem?

 7

The near point of a hypermetropic eye is 1m. What is the power of the lens required to correct this defect ? Assume that the near point of the normal eye is 25 cm.

 8

Why is a normal eye not able to see clearly the objects placed closer than 25 cm?