Newall, H. F · London : Society for Promoting Christian Knowledge · leaf 25
Fig. 3. dealt with in this primer are concerned, to be con-sidered as being always at right angles to the frontsof the waves. When waves spreading from everypoint in a candle-flame (Fig. 4) reach a screen in … Mill IE Fig. 4. which there is a small hole, only small parts of thesuccessive waves pass through the hole, following oneanother along the direction of the ray. Wavefronts.—Fig. 5 represents in perspective afew waves travelling along the surface of water inthe direction of the arrow. If we were…
Spectroscope · Spectrum analysis
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