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Is focal length of eye lens fixed? If no...

Is focal length of eye lens fixed? If not, why?

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Define focal length of a lens

The change in focal length of an eye lens is caused by the action of the:

The image of a small electric bulb fixed on the wall of a room is to be obtained on the opposite wall 3m away by means of a large convex lens. What is the maximum possible focal length of the lens required for the purpose?

The image formed by the lens is erect and its length is three times the length of an object. If the focal length of the lens is 15 cm, what kind of lens it is ? Calculate the object and image distance.

The focal length of a lens is expressed by which of the following:

Violet light is incident on a converging lens of focal length f. State with reasons how focal length of the lens will change, if the violet light is replaced by red light.