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Statement of a problem № 3990

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(a) What is the critical angle for a block of glass, with refractive index ng = 1.45, in air? (b) Two narrow beams of microwave radiation are incident normal to one surface of a large wedge of chocolate as shown in Fig. 15.8. If the index of refraction for chocolate relative to air for these microwaves is 1.2, calculate the angle between the two emerging beams, shown as d on the diagram. (You can assume that the chocolate does not melt because of the microwaves.)

Solution:
(a)  What is the critical angle for a block of glass, with refractive index ng =

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