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The first, the second, and the third media have the permeabilities micro sub 1, micro sub 2, and micro sub 3 respectively. The three vectors B sub 1, B sub 2, and B sub 3 pass through the media which makes the incident and the refraction angles. The incident angle of the first medium is theta sub 1. The refraction angle of the second medium is theta sub 2. The incident angle of the second medium is theta sub 3. The refraction angle of the third medium is theta sub 4.