Answer
$38^{\circ}$
Work Step by Step
As given that $\theta_i+\theta_r=2\theta_i=28^{\circ}$
$\implies \theta_i=14^{\circ}$
Now $\theta_i^{\prime}+\theta_r^{\prime}=2\theta_i^{\prime}$|
$\theta_i^{\prime}+\theta_r^{\prime}=2(14^{\circ}+5^{\circ})=38^{\circ}$
