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according angle appears axis beam beats becomes body bright called centre colours combination complete conjugate consists contains continuous corresponding cross crystal dark denote depends described determined deviation direction directly distance double effect emergent employed equal example experiment fact figure focal length focus frequency fundamental give given glass greater Hence incident increase interval kind latter length lens less light means measured medium mirror move musical natural nearly normal object observer obtained opposite optical ordinary parallel particles pass pipe pitch placed plane plate polarization portion position principal prism produced propagation ratio rays received reflected refraction regarded represented respectively resultant rotation screen seen side slit solid sound spectrum string successive surface telescope tion tone travelling traversing tube turned usually velocity vibrations wave-length waves
Página 911 - When a ray of light passes from one medium to another, it is refracted so that the ratio of the sine of the angle of incidence to the sine of the angle of refraction is equal to the ratio of the velocities in the two media.