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Two events occur simultaneously at separated points on the y axis of reference frame S.According to an observer moving in the positive x direction:
Retina
The thin inner surface of the back of the eyeball; this surface contains the sensory receptors.
Pupil
the black circular opening in the center of the iris of the eye, which regulates the amount of light that enters the eye.
Sensation
The process by which our sensory receptors and nervous system receive and represent stimulus energies from our environment.
Perception
The process of organizing, identifying, and interpreting sensory information to represent and understand the environment or an event.
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