Question

What is the value of $\theta$ in the following ray diagram ?

• A. ${25}^{\circ }$
• B. ${35}^{\circ }$
• C. ${50}^{\circ }$
• D. ${60}^{\circ }$

Answer 1

The correct option is C ${50}^{\circ }$

$\theta =i+r$
from the figure we can say that
$r={25}^0$
and from the laws of reflection
$i=r$
hence for this case
$i={25}^0$
hence $\theta =i+r={25}^0+{25}^0$
$\theta ={50}^0$