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After Testing the Eyes of a Child, the Optician Has Prescribed the Following Lenses for His Spectacles: Left Eye : + 2.00 D Right Eye : + 2.25 D the Child is Suffering from the Defect of Vision Called: (A) Short-sightedness (B) Long-sightedness (C) Cataract (D) Presbyopia - Science

After testing the eyes of a child, the optician has prescribed the following lenses for his spectacles:
Left eye : + 2.00 D
Right eye : + 2.25 D
The child is suffering from the defect of vision called:
(a) short-sightedness
(b) long-sightedness
(c) cataract
(d) presbyopia

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Solution

 long-sightedness

The optician has prescribed convex lenses for the child's spectacles, because a convex lens is used to increase the converging power of the eye lens. This shows that the child is suffering from the defect of vision called long-sightedness.

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Lakhmir Singh Class 10 Physics (Science)
Chapter 6 The Human Eyes And The Colorful World
Q 40 | Page 281
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