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Chemistry of Vision

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what happens to focal length and centre of cuvature of eye lens when an object is placed nearby to eye

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Q. When one is seeing things that are nearby, the ciliary muscles contract to decrease the focal length of the eye lens.

Q. The ciliary muscles in an eye change the focal length of an eye lens to focus distant or nearby objects clearly, this ability of an eye is known as the power of an eye.

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For a human eye lens, for nearby objects, focal length ____ while for far away objects focal length ____ .

Q. The ability of an eye to adjust its focal length by itself to see nearby and distant objects is called as ______________.

Q. An object is placed at a distance of 30 cm from a converging lens of focal length 15 cm. A normal eye (near point 25 cm, far point infinity) is placed close to the lens on the other side. (a) Can the eye see the object clearly? (b) What should be the minimum separation between the lens and the eye so that the eye can clearly see the object? (c) Can a diverging lens, placed in contact with the converging lens, help in seeing the object clearly when the eye is close to the lens?

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