Newall, H. F · London : Society for Promoting Christian Knowledge · leaf 30
very nearly at the samerate in air as in free space, and for our presentpurposes we may regard the x velocity in air and free space asequal, and the refractive indexof air as 1*00. Let us now consider moreclosely the turning of the wave-fronts as they pass from air towater. The front A B (Fig.… … Fig. 13. 24 THE SPECTROSCOPE AND ITS WORK [CHAP. B D is perpendicular to the wavefront A B, and thatthe ray A C is perpendicular to the wavefront CD.Here then we have an indication of the method ofdrawing correct diagrams for the refraction of rays :—From D on the ray DB mark off a length DB…
Spectroscope · Spectrum analysis
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