A ray passes from medium A (μ=1.8) to B (μ=1.5), and then to C (μ=1.2) through parallel interfaces. What is the miniμm incidence angle in A for which the ray fails to enter C?
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A ray passes from medium A (μ=1.8) to B (μ=1.5), and then to C (μ=1.2) through parallel interfaces. What is the miniμm incidence angle in A for which the ray fails to enter C?

G1 Physics · Accepted Answer

For limiting emergence into C, μA sin i=μC. Thus sin i=1.2/1.8=2/3.