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  4. A ray incident a 45° on one refracting surface of a prism of angle 60° , suffers a deviation of 55° . What is the angle of emergence

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Q. A ray incident a $45^\circ $ on one refracting surface of a prism of angle $60^\circ ,$ suffers a deviation of $55^\circ .$ What is the angle of emergence

NTA AbhyasNTA Abhyas 2020

Solution:

Using $\delta=i_{1}+i_{2}-A\Rightarrow 55=45+i_{2}-60$
$\Rightarrow i_{2}=70^\circ $