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Answer»

Answer:

sin⁻¹(8/9)

Explanation:

REFRACTIVE INDICES of glass and water are 1.5 = 3/2 and 4/3.

From SNELL's law,

μ₁ sinθ₁ = μ₂ sinθ₂

The critical angle,

θₙ = sin⁻¹(μ₁/μ₂)

    = sin⁻¹(4/3 * 2/3)

    = sin⁻¹(8/9)

HOPE it HELPS!



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