state the lawls of reflection with diagrams for class 8
Answers
Explanation:
Mammoth Memory
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CONVEX MIRRORS
FLAT MIRRORS
HOW TO DRAW A MIRROR
THE THREE LAWS OF REFLECTION
DO THE THREE LAWS OF REFLECTION MAKE SENSE?
ANY MIRROR OBEYS THE THREE LAWS OF REFLECTION
NORMAL LINE - FLAT MIRRORS
NORMAL LINE - TILTED FLAT MIRRORS
NORMAL LINE AND TWO FLAT MIRRORS AT RIGHT ANGLES
USING THE LAW OF REFLECTION
USING FLAT MIRRORS RAY DIAGRAM RULES
RAY DIAGRAMS FLAT MIRROR RULES SUMMARY
FLAT MIRROR, TILTED, RAY DIAGRAM
FLAT MIRRORS - WHO CAN SEE WHOM - PEOPLE IN A LINE
FLAT MIRRORS - WHO CAN SEE WHOM - PEOPLE RANDOM
WHERE CAN AN OBSERVER SEE A REFLECTED IMAGE?
HOW MUCH OF AN OBJECT CAN AN OBSERVER SEE
SHORTEST MIRROR TO SEE FULL LENGTH OF YOUR BODY
MIRROR EXPERIMENT - SHORTEST MIRROR
LATERALLY INVERTED
PARALLAX
TO REMEMBER THE WORD PARALLAX
PLANE MIRRORS AND PARALLAX EXPERIMENT
FEEDBACK
THE THREE LAWS OF REFLECTION
Any mirror obeys the three laws of reflection, flat, curved, convex or concave.
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
θ
i
equals
θ
r
where
θ
i
=
angle of incidence
θ
r
=
angle of reflection
As the angle of incidence (
θ
i
) increases, the angle of reflection (
θ
r
) 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
θ
i
=
θ
r
Changing the direction of the incident ray changes the angle of the plane.
Plane of incident ray, normal line and refracted ray changed
θ
i
=
θ
r
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.
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Answer:
I = Incident ray
R = Reflected ray
N = Normal
∠ i = angle of incidence
∠ r = angle of reflection
There are two basic laws of reflection of light -
(i) The incident ray the reflected ray and the normal to the reflecting
surface at the point of incidence lie in the same plane ;
(ii) The angle of incidence is always equal to angle of reflection i.e ∠ i = ∠r
