I'll tell you with an example. Say you create a sound by clapping your hands. The sound radiates in all directions, like an expanding sphere. The front edge of the wave is called the wavefront and it is spherical in shape.
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1. o ray obey snail law of refraction, e ray does not obey 2. velocity of o ray is same for all direction, velocity of e ray is diffrent for diffrent direction. 3. for o ray wavefront is spherical, for e ray wavefront is elliptical. 4. ve>vo for negative crystal. 5. vo >ve for positive crystal.
They are not spherical
No, both spherical and hyperbolic geometries are noneuclidian.
Pilots and captains of ship use spherical geometry to navigate their working wheel to move it. They can measure their pathway and destiny by using Spherical Geometry.
The earth, which we live on, is approximately a sphere. It is important, therefore, to know spherical trigonometry.