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geometric optics - Can an electromagnetic wave travel less than the speed of light and yet perceived by the eye as a light? - Physics Stack Exchange
When a light wave passes through a medium straight it slows down inside then speeds up at the exit does it become a standing wave that gains the energy to be able
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Light Waves Light is an electromagnetic wave Light travels at a velocity c = f ( ~ 3x10 8 m/s ) Like sound waves and other waves, light exhibits the. - ppt download
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