A) \[54{}^\circ \]
B) \[45{}^\circ \]
C) \[48{}^\circ \]
D) \[50{}^\circ \]
Correct Answer: C
Solution :
From the relation for angle of deviation angle of incidence \[{{i}_{1}}\] and angle of emergence \[{{i}_{2}}\] are related by the equation \[{{i}_{1}}+{{i}_{2}}=A+\delta .\] The relation for minimum eviation \[{{\delta }_{m}}\] is \[{{i}_{1}}={{i}_{2}}=i\] So, \[2i=A+{{\delta }_{m}}\] or \[{{\delta }_{m}}=2i-A\] \[=(2\times 54{}^\circ -60{}^\circ )=48{}^\circ \]
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