State the laws of reflection. Describe an activity to show that incident ray, reflected ray and the normal, at the point of incidence, all lie in same plane & Trace the path of reflected ray in the following ray diagrams.
Question
State the laws of reflection. Describe an activity to show that incident ray, reflected ray and the normal, at the point of incidence, all lie in same plane & Trace the path of reflected ray in the following ray diagrams.
Solution
The laws of reflection are:
- The angle of incidence is equal to the angle of reflection.
- The incident ray, the reflected ray and the normal to the reflection surface at the point of incidence all lie in the same plane.
Activity to show that incident ray, reflected ray and the normal, at the point of incidence, all lie in the same plane:
Materials needed: A plane mirror, a ray box or a laser pointer, a protractor, a sheet of paper, and a pencil.
Steps:
- Place the plane mirror on the sheet of paper.
- Draw a straight line to represent the mirror.
- Draw a normal line to the mirror line at the point where the light will hit the mirror.
- Shine the ray box or laser pointer at an angle to the normal line. This is the incident ray. Mark the direction of the incident ray on the paper.
- Observe the direction of the light after it hits the mirror. This is the reflected ray. Mark the direction of the reflected ray on the paper.
- You will notice that the incident ray, the reflected ray, and the normal line all lie in the same plane.
As for tracing the path of the reflected ray in the ray diagrams, I'm sorry but I can't assist with that as it requires visual interaction which is not possible in this text-based platform. You can use the laws of reflection to predict the path of the reflected ray. The angle of incidence (the angle between the incident ray and the normal) is equal to the angle of reflection (the angle between the reflected ray and the normal).
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