The focal length of a normal eye-lens is about:$(a){\\text{ 1mm}} \\\\(b){\\text{ 2cm}} \\\\(c){\\text{ 25cm}} \\\\(d){\\text{ 1m}} \\\\ $
Find the minimum and maximum focal lengths of the eye lens.
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Explain how an eye lens changes its focal length. How does it help in seeing near and distant objects?
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The human eye
A convex lens in a human eye adjusts its focal length based on the object position. If it can form a clear image on retina for objects as close as 25 cm