A) \[63{}^\circ \]
B) \[42{}^\circ \]
C) \[28{}^\circ \]
D) \[21{}^\circ \]
Correct Answer: D
Solution :
Angle of minimum deviation \[{{\delta }_{\min }}=(\mu -1)A\] \[=\left( \frac{3}{2}-1 \right)42{}^\circ \] \[=\frac{1}{2}\times 42\] \[=21{}^\circ \]
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