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A beaker of depth a is half filled with olive oil of refractive index $μ_{1}$ and the other half is filled with water of refractive index $μ_{2}$ . The apparent depth of the beaker when viewed from above is $\frac{a (μ_{1} + μ_{2})}{n μ_{1} μ_{2}},$ then n = ____________

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answer is 2.

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