Newall, H. F · London : Society for Promoting Christian Knowledge · leaf 30
direction in the water. 0 REFLECTION, REFRACTION, DISPERSION 23 If we attempt to represent the wavefront in posi-tions intermediate between E and F, Fig. 12 gives afair representation. The index of refractionof a substance (often indi-cated by the letter jx) is anumber which expresses therelation… … Air Water Crown glass Flint glass (light),, ,, (dense),, ,, (extra dense) Refractiveindex.1-000291-3331-5171-5741-6221-650 in free space as in water; the refractive index ofwater is 1-33. Light travels very nearly at the samerate in air as in free space, and for our presentpurposes we may regard…
Spectroscope · Spectrum analysis
Internet Archive · Wellesley College Library · Public Domain Mark 1.0. Free to use for anything.
![An illustration from [Electric engineering.] (1902)](https://img.insideoutlibrary.com/img/200/ia-electricengineer01inte-371-141.webp)
