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

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

Focal length of eye lens is changed by

The focal length of the eye lens is changed due to the action of the……….

The change in focal length of an eye-lens to focus the image of object at varying distances is done by the action of the

The focal length of a normal eye lens is about