A slab of transparent material is made as shown in the given figure. Monochromatic parallel beam....

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A slab of transparent material is made as shown in the given figure. Monochromatic parallel beams of light are normally incident on the slab. The thickness of \(C\) is twice the thickness of \(B\). If the number of waves in \(A =\) number of waves in combination of \(B\) and \(C\), then the refractive index of B is:
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