Question

the angle between the direction of incident sound towards a smooth wall and the direction of sound reflected from the wall is 100 degree what is the value of angle of incidence and angle of reflection ​

Answer 1

Draw a line AB on a plane it resembles the smooth wall.

Take a point C anywhere on AB

Draw a normal CF which bisect these 2 angles.(Normal bisect angles)

So, angle of incidence = angle of reflection

= 100/ 2 = 50°

Answer = 50°