InterviewSolution
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InterviewSolution
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A slab of transparent material is made as shown in Fig. 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. 1.33B. 1.8C. 1.6D. 1.6 |
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Answer» Correct Answer - B Let thickness of `B = t` `:.` Thickness of `C = 2t` and thickness of `A = t + 2 t = 3 t` If `lamda_0` is wavelength in air, then as number of waves in `A = no`, waves in `B + no`. Of waves in `C` `:. (3t)/(lamda_0//mu_0) = (t)/(lamda_0//mu_1) + (2t)/(lamda_0//mu_2)` or `3 mu_0 = mu_1 + 2mu_2` or `mu_1 = 3 mu_0 - 2 mu_2` =`3 xx 1.4 - 2 xx 1.2` =`1.8`. |
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