Answer:
Angle of reflection will be
![40^(\circ)](https://img.qammunity.org/2021/formulas/physics/high-school/1nzymz32b4vc4rhy1k6ug21x2i1esnedn8.png)
Step-by-step explanation:
We have given angle of incidence from the smooth surface is
![40^(\circ)](https://img.qammunity.org/2021/formulas/physics/high-school/1nzymz32b4vc4rhy1k6ug21x2i1esnedn8.png)
So angle of incidence =
![40^(\circ)](https://img.qammunity.org/2021/formulas/physics/high-school/1nzymz32b4vc4rhy1k6ug21x2i1esnedn8.png)
We have to find the angle of reflection
From l;aw of reflection we know that angle of reflection is equal to the angle of incidence
So angle of reflection will be equal to
![40^(\circ)](https://img.qammunity.org/2021/formulas/physics/high-school/1nzymz32b4vc4rhy1k6ug21x2i1esnedn8.png)