Question

A ray incident at 15${}^o$ on one refracting surface of a prism of angle 60${}^o$ suffers a deviation of 55${}^o$. What is the angle of emergence?

• A. 90${}^o$
• B. 45${}^o$
• C. 30${}^o$
• D. None of these

Answer 1

Answer: (D)

None of these

Here, $i_1={15}^o,A={60}^o,\delta ={55}^o,i_2=e=?$

As $i_1+i_2=A+\delta$

$i_2=A+\delta -i_1={60}^o+{55}^o-{15}^o={100}^o$