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Young, Thomas
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Young, Thomas
English physicist, physician, and Egyptologist who revived the wave theory of light and identified the phenomenon of interference in 1801. He also established many important concepts in mechanics.
In 1793, Young recognized that focusing of the eye (accommodation) is achieved by a change of shape in the lens of the eye, the lens being composed of muscle fibres. He also showed that astigmatism is due to irregular curvature of the cornea. In 1801, he became the first to recognize that colour sensation is due to the presence in the retina of structures that respond to the three colours red, green, and violet.
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