In 1617 Snell published Eratosthenes Batavus (1617), in which he explained his method of measuring
the earth. It was the foundation of modern geodesy and earned Snell the title “the father of
triangulation.” In Cyclometricus Snell calculated π to 34 decimal places, now known as Snell’s’
number. His most important discovery, known as Snell’s Law, or the second law of refraction of light
waves, was made after much experimentation. He discovered that a beam of light bent when it passed
into a block of glass. Snell’s Law of Sines states that when a light ray passes from a rarer to a denser
medium, for instance from air to water (Figure 10.19), it is bent toward the normal (vertical line) and
that the ratio of the sine of the angle of incidence (sin θ1) to the sine of the angle of refraction (sin θ2) is
constant for a particular wave length. Snell died at age 46, never knowing the importance of his
discovery of the basic laws of refraction or the prominent place his name occupies in physics and
optics.
In 1617 Snell published Eratosthenes Batavus (1617), in which he explained his method of measuring
the earth. It was the foundation of modern geodesy and earned Snell the title “the father of
triangulation.” In Cyclometricus Snell calculated π to 34 decimal places, now known as Snell’s’
number. His most important discovery, known as Snell’s Law, or the second law of refraction of light
waves, was made after much experimentation. He discovered that a beam of light bent when it passed
into a block of glass. Snell’s Law of Sines states that when a light ray passes from a rarer to a denser
medium, for instance from air to water (Figure 10.19), it is bent toward the normal (vertical line) and
that the ratio of the sine of the angle of incidence (sin θ1) to the sine of the angle of refraction (sin θ2) is
constant for a particular wave length. Snell died at age 46, never knowing the importance of his
discovery of the basic laws of refraction or the prominent place his name occupies in physics and
optics.
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