Reflection is one of the most important properties of light relating to fiber optics. Newton’s law states,
“The angle of incidence equals the angle of reflection,” that is, sin θ1 = sin θ2. Refraction is another
important property that light exhibits when traveling through different media. In 1860 Alexander
Graham Bell demonstrated voice transmission using mirrors that were vibrated by the sound waves of
the voice. The light reflected off the mirrors was modulated by the sound. Bell was able to focus the
modulations onto a selenium plate, which resulted in resistance changes caused by changes in the
intensity of the light. These changes then activated a speaker-like instrument. In 1870, John Tyndall
concluded that light could follow a curved path as well as a straight line. At the turn of the century,
Planck developed quantum theory. In 1905 Einstein explained the photoelectric effect using quantum
theory. In 1930 William Lamb, Jr. made some of the earliest experiments with guiding light in a glass
fiber, and in 1951 American researchers demonstrated the transmission of an image through a bundle of
glass fibers.
Reflection is one of the most important properties of light relating to fiber optics. Newton’s law states,
“The angle of incidence equals the angle of reflection,” that is, sin θ1 = sin θ2. Refraction is another
important property that light exhibits when traveling through different media. In 1860 Alexander
Graham Bell demonstrated voice transmission using mirrors that were vibrated by the sound waves of
the voice. The light reflected off the mirrors was modulated by the sound. Bell was able to focus the
modulations onto a selenium plate, which resulted in resistance changes caused by changes in the
intensity of the light. These changes then activated a speaker-like instrument. In 1870, John Tyndall
concluded that light could follow a curved path as well as a straight line. At the turn of the century,
Planck developed quantum theory. In 1905 Einstein explained the photoelectric effect using quantum
theory. In 1930 William Lamb, Jr. made some of the earliest experiments with guiding light in a glass
fiber, and in 1951 American researchers demonstrated the transmission of an image through a bundle of
glass fibers.
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