X = 43\frac{4}{3}34 r = ?
Shell’s law:. = sini∘sinr∘\frac{\sin i^{\circ}}{\sin r^{\circ}}sinr∘sini∘
= sin30∘sinr∘\frac{\sin 30^{\circ}}{\sin r^{\circ}}sinr∘sin30∘
Sinr∘r^{\circ}r∘ = 3sin30∘4\frac{3\sin 30^{\circ}}{4}43sin30∘
Sin r∘r^{\circ}r∘ = 0.375
R ∘^{\circ}∘ = Sin-1 (0.375)
R ∘^{\circ}∘ = 22.02 ∘^{\circ}∘
R ∘^{\circ}∘ = 22 ∘^{\circ}∘
