how does our focal length changes if we observe a bird approaching us? why?
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Answer:
The focal length decreases as we watch a bird approaching us
Explanation:
Just try to observe that whenever you bring something closer to your eye, the strain on the eyes increases which means the ciliary muscles have to contract to make the eye lens thicker and increase its curvature. If we increase the curvature gradually the focal length decreases. Therefore seeing any object approaching us decreases the focal length of the eye lens
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