n, with the modification that now the velocity of light inthe lower medium is greater than that in the upper. Suppose,for instance, that the velocities in the two media, and the angleof incidence, have such values that while light travels the dis-tance b2bn in the upper medium it will travel a… … Figure 24 let and it will be impossible to draw a plane through b3 tangentto this sphere. When the angle of incidence has exactly thecritical value, a2a4 the radius of the secondary wavelet froma2j is just equal to a2b3. One of the most effective ways ofshowing total reflection is that illus-trated…
Light
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