If a ray make an angle of 30' with mirror then:-i}angle of incidence = (normal-given angle)=>( 90-30) =>60'.ii}hence angle of reflection =60'. ...... ............. (i=r)iii} Total angle turned by ray = (i+r) => 60'+60'=>120'.That's all.

Answer:

Angle of incidence:
- The angle between the incident ray and the normal to the mirror is the angle of incidence.
- In this case, the angle between the incident ray and the mirror is given, which is 30 degrees.
- The angle of incidence is equal to the angle between the incident ray and the normal to the mirror, which is 60 degrees (since the angle of incidence and angle of reflection are equal).

Angle of reflection:
- The angle between the reflected ray and the normal to the mirror is the angle of reflection.
- Since the angle of incidence and angle of reflection are equal, the angle of reflection is also 60 degrees.

Total angle turned by the ray of light:
- When a ray of light undergoes reflection, it changes direction.
- The total angle turned by the ray of light is equal to the sum of the angle of incidence and angle of reflection, which is 120 degrees.
- This is because the ray of light turns away from the normal to the mirror by an angle of 60 degrees during reflection, and then turns towards the normal to the mirror by another angle of 60 degrees as it continues to propagate.

Explanation:
- In this scenario, we have an incident ray of light that hits a mirror at an angle of 30 degrees.
- The angle of incidence is the angle between the incident ray and the normal to the mirror, which is 60 degrees in this case, since the angle of incidence and angle of reflection are equal.
- The angle of reflection is the angle between the reflected ray and the normal to the mirror, which is also 60 degrees in this case.
- The total angle turned by the ray of light is the sum of the angle of incidence and angle of reflection, which is 120 degrees.
- This is because the ray of light turns away from the normal to the mirror by an angle of 60 degrees during reflection, and then turns towards the normal to the mirror by another angle of 60 degrees as it continues to propagate.