Trace reflection and refraction
See this course’s project requirements
A wave model comparison with period/frequency calculations, reflection and refraction diagrams and an explanation of a fictional communication failure.
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What to include
- Separate traveling patterns from local material motion.
- Calculate period and frequency from complete cycles.
- Compare amplitude under stated fixed conditions.
- Compute sound wavelength and explain medium requirements.
- Draw reflection and qualitative refraction using normals.
- Explain the chamber signal failure and complete all changed cases.
Review and revise
Use these criteria to check your work and choose what to improve.
- Method: applies the course-specific rules to the supplied cases with visible intermediate work.
- Accuracy: results agree with the stated facts, units, boundaries and independent checks.
- Reasoning: explains why the result follows and identifies a limitation or unresolved question.
- Transfer: completes changed cases and revises the final project when a relevant assumption changes.
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The idea in everyday life
Desk ray A strikes a flat mirror at 30 degrees from the normal. Ray B enters a slower transparent medium at an oblique angle. A normally incident ray C crosses the same boundary straight on. No lasers, mirrors in sunlight or experiments are required.
Reflection sends a ray back into its original medium; on a flat ideal mirror the reflected angle equals the incident angle measured from the normal, an imaginary line perpendicular to the surface. Refraction occurs when propagation speed changes across media; an oblique ray bends toward the normal when it enters a slower medium in this simple model. Measure from the normal rather than from the surface.
Trace reflection and refraction — worked practice
Reflection sends a ray back into its original medium; on a flat ideal mirror the reflected angle equals the incident angle measured from the normal, an imaginary line perpendicular to the surface. Refraction occurs when propagation speed changes across media; an oblique ray bends toward the normal when it enters a slower medium in this simple model. Measure from the normal rather than from the surface.
Desk ray A strikes a flat mirror at 30 degrees from the normal. Ray B enters a slower transparent medium at an oblique angle. A normally incident ray C crosses the same boundary straight on. No lasers, mirrors in sunlight or experiments are required.
1. 1. Normal
Draw a surface line and a perpendicular normal.
You should see: Angle labels use the normal as zero.
2. 2. Reflect
Mark ray A’s reflected angle.
You should see: 30 degrees from the normal on the reflected side.
3. 3. Refract
Draw the qualitative path for B.
You should see: It bends toward the normal when entering the stated slower medium.
4. 4. Exception
Describe C under normal incidence.
You should see: It changes speed without changing direction in this idealized boundary model.
What to finish
Three ray diagrams with angle reference and normal-incidence exception.
Watch for this
At normal incidence the ray is already along the perpendicular direction. In this idealized case, speed can change while direction stays straight.
How can I tell I understand it?
Apply a changed mirror angle without measuring it from the surface.
Quick knowledge check
Answer all 3 questions. Get at least 2 right and the lesson completes automatically.
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Source & access notes · checked 2026-10-01
Web open/search showed the official page, its topic heading and relevant concept description. This is a content/source check, not a provider endorsement.
Access: Official page retrieved with the web reader on 2026-10-01; interactive tools and videos were not certified by retrieval.
Reuse: Original fictional teaching cases, calculations, questions and examples; link and short factual paraphrase only. No copied source exercises or illustrations.
Source & access notes · checked 2026-10-01
Web open/search showed the official page, its topic heading and relevant concept description. This is a content/source check, not a provider endorsement.
Access: Official page retrieved with the web reader on 2026-10-01; interactive tools and videos were not certified by retrieval.
Reuse: Original fictional teaching cases, calculations, questions and examples; link and short factual paraphrase only. No copied source exercises or illustrations.
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