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Q. Define: optic axis of a crystal.
In a double refracting crystal there is a particular direction in which both the rays travel with same velocity. This direction is called as optic axis.
The refractive index is similar for both rays and there is no double refraction along this direction.
Describe the theory of black body. Black body At an exact temperature the black body would produce the maximum amount of energy probable for temperature. This would emit at
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