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A fish in water, looks upward at an unobstructed overcast sky. what total angle does the sky apper to substend?
Critical angleC = sin^-1 (1/mu)C = sin^-1( 1/sqrt(2) )C = 45° Total angke does the sky appear to subtendTheta = 2*C = 90° RegardsArun (askIITians forum expert)
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