...consider the incident ray in water, refracted at a surface where the water meets a block of glass, we call the ratio of the sines of the angles of incidence and refraction in this case the index of refraction from water to glass. If only one medium is specified, it is assumed...

...consider the incident ray in water, refracted at a surface where the water meets a block of glass, we call the ratio of the sines of the angles of incidence and refraction in this case the index of refraction from water to glass. If only one medium is specified, it is assumed...

...fundamental law of refraction was discovered by Snell about 1621. According to the wave theory of light, the ratio of the sines of the angles of incidence and refraction is identical with the ratio of the velocities of light in the two media. The ratio is termed the index...

...three centuries were to pass before the discovery of the law of sines, that is to say, the law that the ratio of the sines of the angles of incidence and refraction is constant for refraction in the same medium, was effected by Snell and Descartes. It might seem,...

...ratio of the velocities in the two media is 3 to 2. Prove that the index of refraction is equal to the ratio of the sines of the angles of incidence and refraction. 6. A parallel beam of light falls on a glass prism making an angle of 70° with the surface of the...

...refraction. In every principal section the extraordinary ray follows the second law of refraction only, but the ratio of the sines of the angles of incidence and refraction is not constant. (Ganot's Physics, art. 656.) DOUBLE REFRACTION IN BIAXIAL CRYSTALS: GENERAL STATEMENT....

...the angle and consequently the less the sine of the angle, and as the refraction between two media is the ratio of the sines of the angles of incidence and refraction (- -Lit will ^sin T' be seen that whenever the sine of the angle of refraction is increased by being...

...case of glass and other non-crystalline media. One of the beams obeys the ordinary laws of refraction, the ratio of the sines of the angles of incidence and refraction being always the same, no matter what the angle of incidence may be. It is therefore called the "ordinary"...

...construction is given for drawing the refracted ray. The modern form of stating the law in terms of the ratio of the sines of the angles of incidence and refraction (p. 66) was given first by DESCARTES (§ 28) in his Dioptrique published in 1637. 197. Reflection Prisms....

...Willebrod Snell in 1621. Snell's statement did not have to do with velocities. He merely stated that the ratio of the sines of the angles of incidence and refraction was constant for any two media. Huyghens showed that the ratio of the sines was also equal to the ratio...