Light Reflection Ray Challenge
A light ray strikes a mirror and changes direction. Your mission is to identify the incident ray, locate the normal, compare the angles and predict the path of the reflected ray.
Your mission: Follow the rays carefully, solve five reflection cases and become a certified ray-tracing detective.
Eye safety: Never shine a laser pointer, torch or reflected beam into anyone’s eyes. Classroom reflection activities should use a low-power torch under responsible adult or teacher supervision.
Meet the Parts of a Reflection Diagram
Incident Ray
The incident ray is the incoming light ray travelling towards the mirror.
Reflected Ray
The reflected ray is the light ray that leaves the mirror after reflection.
Normal
The normal is an imaginary line drawn at 90 degrees to the mirror at the point where the ray strikes.
Point of Incidence
This is the exact point where the incident ray reaches the reflecting surface.
Animated Ray Experiment
The red incident ray is already travelling towards the mirror. Activate the experiment to reveal the correct reflected ray.
The reflected ray is hidden. Predict its direction before revealing it. The reflected ray appears on the opposite side of the normal at the same angle. The incident angle is 35°, so the reflection angle is also 35°.
Reflection in a Periscope
How the Light Travels
Light from the object enters the top of the periscope and reflects from the upper mirror.
It then travels down the tube and reflects again from the lower mirror towards the observer’s eye.
Each reflection follows the same law: the angle of incidence equals the angle of reflection.
Three-Question Reflection Check
1. From which line are reflection angles measured?
Correct! Both angles are measured between the ray and the normal.
Not quite. Reflection angles are measured from the normal.
2. If the angle of incidence is 60°, what is the angle of reflection?
Correct! The two angles are equal, so the reflected angle is 60°.
Not quite. Apply the law of reflection: 60° in means 60° out.
3. What type of reflection occurs on a smooth mirror?
Correct! A smooth mirror produces regular reflection and can form a clear image.
Not quite. Smooth surfaces produce regular reflection.
Memory Challenge: Rebuild the Ray Diagram
Study these four terms. Close the section and try to place them correctly in an imaginary reflection diagram.
Frequently Asked Questions
What is reflection of light?
Reflection is the change in direction that occurs when light strikes a surface and returns into the same medium.
What is the law of reflection?
The law of reflection states that the angle of incidence equals the angle of reflection. Both angles are measured from the normal.
What is the normal in a ray diagram?
The normal is an imaginary line drawn perpendicular to the reflecting surface at the point where the incident ray strikes it.
Why does a mirror form a clearer image than a wall?
A smooth mirror produces regular reflection, so reflected rays remain organised. A rough wall scatters rays in many directions and does not form a clear image.
How can students investigate reflection safely?
Students can use a small plane mirror, paper and a low-power torch under teacher supervision. Light, laser pointers and reflected beams must never be directed towards anyone’s eyes.
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