History of Light
Scientists have tried to elucidate the nature of light since the beginning of time. Newton, in the seventeenth century, asserted that light was formed by very tiny corpuscles (particles).
Later, Huygens stated that light was a wave, basing this affirmation on its undulatory (wave like) characteristics; however the author believes a wave is not viable without a medium that could transmit it.
It was then when the concept of "ether" (the medium) was invented, but the investigators Michelson and Morley`s made experiments demonstrating that ether does not exist. Simultaneously, they also demonstrated a more important fact: The speed of light is constant.
At the beginning of this century, Planck and Einstein did not agree with the undulatory theory of light; rather they supported the corpuscle theory and called them photons, each formed by one particle, traveling in a straight line when acting within dimensions larger than its wavelength.
However, when observing very small objects whose dimensions are in the same order of magnitude as the lights wavelength, it appears as if light turns around; so its trajectory is curved and since it fits mathematically to sine equations, it has been believed that light trajectory is sinusoidal.
Also, Newton determined that red light particles are larger than blue ones, both being corpuscles. He reinforced the fact that when two light beams cross one another, practically no collisions occur. Only when light beams travel in slightly convergent trajectories such as when making experiments concerning interference of one and two slots, light interferes with itself, canceling the beam if the phase differential is 180 degrees, and doubling the intensity if the differential is 0 or 360 degrees.
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