A) \[{{45}^{o}}\]
B) \[{{39}^{o}}\]
C) \[\text{2}{{\text{0}}^{\text{o}}}\]
D) \[\text{3}{{\text{0}}^{\text{o}}}\]
Correct Answer: D
Solution :
Angle of incidence = angle of emergence ie, \[i=i\] Also, \[i=\frac{3}{4}\times \] angle of equilateral prism \[=\frac{3}{4}\times {{60}^{o}}={{45}^{o}}\] Thus, angle of deviation \[=i+i-A\] \[=({{45}^{o}}+{{45}^{o}}-{{60}^{o}})={{30}^{o}}\]
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