what is optic nerve and pupil?
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optic nerve:The optic nerve is a bundle of nerve fibers that serves as the communication cable between your eyes and your brain.
optic pupil:In an optical system, the entrance pupil is the optical image of the physical aperture stop, as 'seen' through the front (the object side) of the lens system. ... The entrance pupil is usually a virtual image: it lies behind the first optical surface of the system.
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