The Corner Mirror is an engaging experiment that demonstrates the concept of reflection using corner mirrors. In this activity, participants will explore the behavior of light as it reflects off two perpendicular mirrors at a 90-degree angle, creating a fascinating visual effect.
Materials Needed:
- Two small mirrors (square or rectangular shape)
- Cardboard or foam board
- Tape or glue
- Light source (for example, flashlight or smartphone flashlight)
Instructions:
- Introduction: Begin by introducing the concept of reflection and how light bounces off surfaces. Explain that mirrors are highly reflective surfaces that can create interesting optical effects.
- Mirror Placement: Arrange the two small mirrors to form a right angle (90 degrees) by placing the edges of the mirrors perpendicular to each other.
- Mounting the Mirrors: Attach the mirrors to the cardboard or foam board using tape or glue. Ensure that the mirrors are securely fixed and the right angle is maintained.
- Corner Mirror Setup: Stand the corner mirror setup vertically on a flat surface, with the two mirrors forming a 90-degree corner.
- Light Source: Direct the light source (flashlight or smartphone flashlight) toward the corner of the mirrors, aiming it into the corner where the mirrors meet.
- Observations: Observe the visual effect as light reflects off the mirrors. Participants will see a series of infinite reflections forming a “tunnel” effect.
- Rotating the Setup: Encourage participants to rotate the corner mirror setup slightly and observe how the reflections change as the angle between the mirrors is adjusted.
- Discussion: Lead a discussion about the observations. Explain that the multiple reflections occur because each mirror reflects the light from the other mirror, creating an infinite reflection pattern.
- Applications (Optional): Discuss real-life applications of mirrors and reflection, such as in periscopes, kaleidoscopes, and various optical devices.
Safety Precautions:
- Be cautious when using glass mirrors to avoid breakage and sharp edges. Alternatively, acrylic mirrors can be used for added safety.
- Adult supervision is recommended, especially for younger participants.
The Corner Mirror provides an exciting demonstration of the principles of reflection and how mirrors interact with light. It promotes curiosity, observation, and critical thinking while allowing participants to explore optical effects and the behavior of light. Additionally, it introduces real-life applications of mirrors and the importance of reflection in various optical devices and technologies.
| STEM Concept | Explanation and Application |
| Science Concepts | |
| Reflection | Understanding how light bounces off surfaces, particularly the behavior of light when it encounters mirrors. |
| Optics | Exploring the principles of optics and the formation of reflections in mirrors and other optical devices. |
| Infinite Reflections | Observing the visual effect of infinite reflections as light bounces between the two perpendicular mirrors. |
| Technology Concepts | |
| Optical Devices | Understanding the use of mirrors in various optical devices, such as periscopes, kaleidoscopes, and telescopes. |
| Light Sources | Exploring different light sources and their effects on the reflections within the corner mirror setup. |
| Mirror Materials | Exploring different mirror materials, such as glass or acrylic, and their reflective properties. |
| Engineering Concepts | |
| Mirror Placement | Applying engineering principles to position the mirrors at a right angle and secure them on the cardboard/foam board. |
| Stability and Support | Ensuring the stability of the corner mirror setup and choosing suitable materials for mounting the mirrors. |
| Adjustment and Calibration | Engineering adjustments to the setup to achieve desired reflection effects and angles. |
| Mathematics Concepts | |
| Angle Measurement | Understanding the concept of angles, particularly the 90-degree angle formed by the two perpendicular mirrors. |
| Reflection Patterns | Exploring the patterns and symmetries created by the infinite reflections within the corner mirror setup. |
| Trigonometry | Applying trigonometric concepts to analyze angles and light directions within the corner mirror system. |
| Spatial Geometry | Understanding spatial relationships between the mirrors, light source, and the observer’s perspective. |
Corner Mirror. Each concept can be further explored and expanded based on the age, understanding, and interests of the participants. The activity provides an interdisciplinary learning experience, integrating scientific, technological, engineering, and mathematical concepts while fostering curiosity and hands-on exploration of reflection and optical effects.