Phillips, Percy · London : T. C. & E. C. Jack ; New York : Dodge Pub. Co. · leaf 54
from B to H in the airin order to reach the wave-front EH, whilst the rayBDE has to travel the distance BD and DE in the filmin order to reach the same position. There is thereforea path difference between the two rays which is greaterthe greater the thickness of the film and which alsoincreases… … 52 THE SCIENCE OF LIGHT colours in the spectrum are merely waves of differentlengths the different colours will be reinforced withdifferent thicknesses of film and with different obliquities,and so the well-known coloured effects of soap filmsand other thin films are produced. Newtons Eings.—Newton…
Light
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