Fill in the missing words
According to Huygen's theory of double refraction, every point in a double refracting medium is a source of ______
types of wave fronts.
The shape of O-wave is special
The shape of E-wave is _______
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According to Huygen's theory, a point in a doubly refracting or birefringent crystal produces 2 types of wavefronts. The wavefront corresponding to the O-ray is spherical wavefront. The ordinary wave travels with same velocity in all directions and so the corresponding wavefront is spherical.
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