In which of the following ways, focusing is done in a healthy human eye?

Options :
  1. By the to and fro movement of the eye lens.
  2. By the changing curvature of the retina.
  3. By the change in the convexity of the lens through ciliary muscles.
  4. By the change in the refractive index of the eye fluid.


Answer and Explanation :-

Answer: Option 3

Explanation:

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