Two transparent slabs have the same thickness as shown in Fig. One is made of material A of refractive index. 1.5. The other is made of two materials B and C having thickness in ratio 1 : 2, the refractive index of C is 1.6. If a monochromatic parallel beam passing through the slabs has the same number of wavelengths inside both, the refractive index of B is -
Text Solution
Verified by ExpertsThe correct answer is:
C
No. of wavelength are same
so optical path length will be same
µ A x A = µ B x B + µ C x C
(1.5) t = µ B 
+ (1.6) 
4.5 = µ B + 3.2 ⇒ µ B = 1.3
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