three laws of reflection
Answers
Answer:
The laws of reflection are as follows: The incident ray, the reflected ray and the normal to the reflection surface at the point of the incidence lie in the same plane. The angle which the incident ray makes with the normal is equal to the angle which the reflected ray makes to the same normal.
Answer:
The three laws of reflection are
1. The angle between the incident ray and the normal is equal to the angle between the reflected ray and the normal
2. The incident ray, the normal and the reflected ray are all in the same plane
3. Incident ray and refracted ray are on different sides of the normal
Law 1 explained
The angle between the incident ray and the normal is equal to the angle between the reflected ray and the normal.
Diagram of incident ray normal line and reflected ray on a mirror
This means that θi
equals θr
where
θi=
angle of incidence
θr=
angle of reflection
As the angle of incidence (θi) increases, the angle of reflection (θr) also increases and they are always equal to each other.
Ray diagram showing refracted ray as angle of incidence increases
Ray diagram showing refracted ray as angle of incidence decreases
Law 2 explained
The incident ray, the normal and the reflected ray are all in the same plane.
Plane of incident ray, normal line and refracted ray
θi=θr
Changing the direction of the incident ray changes the angle of the plane.
Plane of incident ray, normal line and refracted ray changed
θi=θr
Again the incident ray, the normal line and the reflected ray all lie in the same plane.
Law 3 explained
The incident ray and the reflected ray are on different sides of the normal.
The incident ray and refracted ray must be on opposite sides of the normal line.
The above diagram is wrong. The incident ray and the reflected ray can not be on the same side of the normal.
Incident ray and refracted ray on opposite sides of the normal line
The incident ray and reflected ray must be on different sides of the normal.
Explanation:
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