Two transparent slabs have the same thickness as shown. One is made of – McqOptions

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1.	Two transparent slabs have the same thickness as shown. One is made of material A of refractive index 1.5. The other is made of two materials B and C with thickness in the 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 waves inside both, the refractive index of B is
A.	1.1
B.	1.2
C.	1.3
D.	1.4
Answer» D. 1.4

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