CBSE Class 10 Science 2019 · Paper 31/1/3 · Question 3
What happens to the image distance in the normal human eye when we decrease the distance of an object, say 10 m to 1 m ? Justify your answer.
Answer
It stays the same, because the image always forms on the retina; the lens adjusts its focal length instead.
The image distance remains the same. In the eye the image is always formed on the retina, so the image distance is the distance between the eye lens and the retina, which is fixed. When the object is brought from 10 m to 1 m, the ciliary muscles contract, the eye lens becomes thicker and its focal length decreases (accommodation), so the image of the nearer object is still formed on the retina.
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