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Q.

The least distance for distinct vision for a normal person is:



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a

1 m

b

25 cm

c

10 cm

d

None of these 

answer is B.

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Detailed Solution

Concept: The muscles in the eye adjust the lens in the human eye, changing the distance from the retina and the focal length of the lens so that a bright, sharp image is formed at the retina. Strain on the muscles is required, which can be harmful to the eye.
 It is possible to view objects closer than the minimum distance for distinct vision, but doing so causes eye strain.
That distance is 25 cm for an average adult human being. It varies from person to person, but the average is around 25 cm.
As a result, the correct answer is 2, which is 25 cm.
 
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