The human eye is like a camera that has a lens with :
fixed focal length and fixed aperture size.
variable focal length and fixed aperture size.
fixed focal length and variable aperture size.
variable focal length and variable aperture size.
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This question was previously asked in
UPSC NDA-1 – 2024
The lens of the human eye (specifically the crystalline lens and the cornea) changes its shape through a process called accommodation. This change in shape alters the focal length of the lens, allowing the eye to focus on objects at different distances, similar to a zoom lens in a camera. The iris controls the size of the pupil, which acts as the aperture. By changing the pupil size, the eye regulates the amount of light entering the retina, similar to adjusting the aperture size (f-number) on a camera.