A driver at a depth 12 m inside water (μ = 4/3) see the sky in a cone of semi-vertical angle is
A. sin-1\(\left( \frac { 4 }{ 3 } \right) \)
B. tan-1\(\left( \frac { 4 }{ 3 } \right) \)
C. sin-1\(\left( \frac { 3 }{ 4 } \right) \)
D. 90°
Answer:C
A driver at a depth 12 m inside water (μ = 4/3) see the sky in a cone of semi-vertical angle is
A. sin-1\(\left( \frac { 4 }{ 3 } \right) \) B. tan-1\(\left( \frac { 4 }{ 3 } \right) \) C. sin-1\(\left( \frac { 3 }{ 4 } \right) \) D. 90°