Sentence Examples with the word WAVE LENGTH

Since the index of refraction varies with the colour or wave length of the light (see Dispersion), it follows that a system of lenses (uncorrected) projects images of different colours in somewhat different places and sizes and with different aberrations; i.e.

The magnetic and electric forces are directed alternately in one direction and the other, and at distances which are called multiples of a wave length the force is in the same direction at the same time, but in the case of damped waves not quite the same intensity.

Gallium is best detected by means of its spark spectrum, which gives two violet lines of wave length 4171 and 4031.