Newall, H. F · London : Society for Promoting Christian Knowledge · leaf 27
onsidered, and is called the wavefront. Thus the wave--QtP is the small part of this surface as it passesoss PrSEf^the wavefront of disturbances emanatingrequired at Q, we have only to consider theexpanding^surface^vhen it reaches Q ; the wavefrontat Q coincidesN^ith\£he part of that surface… … Fig. 7. in perspective a number of successive wavefronts,or equally well a single wavefront in a number ofsuccessive positions ; the clotted lines represent therays that correspond with the corners of the beamemanating from the source C. Fig. 4 on page 18 may now be referred to oncemore, and the…
Spectroscope · Spectrum analysis
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