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Using Huygens's principle, construct the wavefronts and the propegation directions of the ordinary and extraordinary rays in a positive uniaxial crystal whose optical axis (a) is perpendicualr to the incidence plane and parallel to the surfcae of the crystal, (b) lies in the incidence plane and is parallel to the surface of the crystal, (c ) lies in the incidence plane at an angle of 45^(@) to the surface of the crystal, and light falls at right angles to the optical axis. |
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Answer» Solution :The wave surface of a unixial crystal consists of TWO sheets of which on eis a sphere while the other is an ellipsoid of revolution. The optic axis is the line joining the points of contact. To MAKES the appropriate Huyghen's construction we MUST drawthe relevent section of the wave surface inside the crystal and determine the direction of the ordinary and extraordianry rays. The result is as SHOWN in Fig. `(a, B& c)` of the answers 
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