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[" 15.A glass-slab is immersed in water.What will be the critical "],[" angle for a light ray at glass-water interface? Where "],[a^(n)g=1.50,an_(w)=1.33" and "sin^(-1)(0.887)=62.5],[[" (a) "48.8^(@)," (b) "72.8^(@)],[" (c) "62.5^(@)," (d) "64.5^(@)]]

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