Ball, R[obert] S[tawell], Sir, 1840- [from old catalog] · New York, H. Holt and company · leaf 166
umstance that the amount ofbending which a ray of light undergoes when it passesthrough a prism varies with the colour of the light. § 113. Construction of the Spectroscope.—Sup-pose a b c, fig. 40, to represent a prism of flint glass.If a ray of ordinary white light travelling along thedirection p… … amount of the bending is, howrever, dependent uponthe colour of the light. In a beam of white light wehave blended together the seven well-known prismaticcolours, viz., red, orange, yellow, green, blue, indigo,violet. We shall trace the course of the first of theseand the last. The red light is the…
Astronomy
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