A slab of transparent material is made as shown in Fig. \( 9(\mathrm{CF}) .10 \). Monochromatic ...
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0A slab of transparent material is made as shown in Fig. \( 9(\mathrm{CF}) .10 \). 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 :
(A) \( 1.33 \)
(B) \( 1.8 \)
(C) \( 1.6 \)
(D) \( 1.4 \)
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