The muscles of a normal eye are least strained when the eye is focu...

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The muscles of a normal eye are least strained when the eye is focussed on an object
(a) far away from the eye
(b) very close to the eye
(c) at about \( 25 \mathrm{~cm} \) from the eye
(d) at about \( 1 \mathrm{~m} \) from the eye.
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