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# Form 3 Physics Refraction of Light Questions and Answers

Figure 1 shows the path of array of yellow light through a glass prism. The speed of yellow light in the prism is 1.88 x 10^8 m/s.

(a) Determine the refractive index of the prism material for the light (speed of light in vacuum c = 3.0 x 10^8 ms^-1).
(b) Show on the figure the critical angle, c, and determine its value.
(c) Given that r = 21.2^0, determine the angle theta .
(d) On the same figure, sketch the path of the light after striking the prism if the prism was replaced by another of similar shape but lower refractive index.