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Questions and Answers
What is the relationship between the angle of incidence and the angle of reflection?
What is the relationship between the angle of incidence and the angle of reflection?
The angle of incidence is always equal to the angle of reflection.
What happens to light when it hits a mirror along the normal?
What happens to light when it hits a mirror along the normal?
When light hits a mirror along the normal, it reflects back along the same path.
How can one observe the reflected ray when bending the sheet of paper in the experiment?
How can one observe the reflected ray when bending the sheet of paper in the experiment?
The reflected ray can still be observed by ensuring that the bent portion of the paper is aligned with the path of the reflected ray.
Define the angle of incidence in terms of its relationship to the normal.
Define the angle of incidence in terms of its relationship to the normal.
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In the law of reflection, what would happen if you change the angle of incidence?
In the law of reflection, what would happen if you change the angle of incidence?
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In the context of light as a narrow beam composed of multiple rays, what is a ray of light?
In the context of light as a narrow beam composed of multiple rays, what is a ray of light?
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What materials were used in Activity 13.2 to observe reflection?
What materials were used in Activity 13.2 to observe reflection?
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What is the significance of measuring the angles of incidence and reflection in experiments?
What is the significance of measuring the angles of incidence and reflection in experiments?
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Study Notes
Reflection of Light
- Light rays act as idealisations, but in reality, beams of light are made up of multiple rays.
- For simplicity, the term "ray" is frequently used for a concentrated beam of light.
- Draw lines to represent a mirror, the incident ray and reflected ray,
- A normal line drawn at 90 degrees to the mirror at the point where the ray strikes helps visualise the angle of incidence (i) and the angle of reflection (r).
- The angle of incidence (i) is the angle between the normal and the incident ray.
- The angle of reflection (r) is the angle between the normal and the reflected ray.
- The angle of incidence equals the angle of reflection (i = r)
Activity 13.1
- This activity involves measuring the angle of incidence and angle of reflection.
- This should be done multiple times, changing the angle of incidence
- Recorded data should be logged in a table.
Activity 13.2
- Repeat Activity 13.1, using a sheet of stiff/chart paper that extends beyond the table edge.
- Cut the projecting portion of the sheet in half.
- Ensure the reflected ray continues to the projected portion of the paper.
- Bend the section of the paper where the reflected ray falls.
- Observe if the reflected ray is still visible.
- Move the paper back to its original position.
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Description
This quiz focuses on the concepts of reflection of light, including the measurement of the angle of incidence and reflection. Through activities, you will explore how light interacts with mirrors and reinforce the understanding that the angle of incidence equals the angle of reflection. Log your observations and results in a structured way.
