A person can see clearly object only when they lie between 50 cm to 400 cm from his eyes. In order to…

A person can see clearly object only when they lie between 50 cm to 400 cm from his eyes. In order to increase the maximum distance of distinct vision to infinity, the type and power of the correcting lens, the person has to use, will be
  1. Convex, +2.25 D
     
  2. Concave, -0.25 D
     
  3. Concave, -0.2 D
     
  4. Convex, + 0.15 D
     

Solution

The maximum distance of distinct vision = 400 cm. So the image of the object at infinity is to be formed at 400 cm.
Use lens formula
1v-1u=1f
1-400-1∞=1f
P=-0.25 D

Asked in: NEET 2016 (Phase 2)

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