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🔭 Refraction and Snell’s Law

Learn how light bends at a boundary, why angles use the normal, and when total internal reflection can occur.

2
lessons
~5 min
to learn
🔬 Science
subject
Adults
level
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What you’ll learn

  1. Read the BoundaryIdentify the normal, refractive index, and wave quantities at a boundary.Refraction begins with a speed change; the normal and index keep the geometry and media in order.
  2. Predict the BendPredict bending direction and test for total internal reflection.Compare indices first, then use Snell’s law and the critical-angle conditions to check the ray.

Questions this course answers

From which line are refraction angles measured?

The normal is perpendicular to the interface, and Snell’s law uses angles from it.

What does a larger refractive index mean?

n = c/v, so larger n corresponds to smaller speed v.

What stays fixed for light crossing an ordinary boundary?

The source fixes frequency; speed and wavelength can change in the new medium.

What two conditions allow total internal reflection?

The ray must start in the higher-index medium and exceed the critical angle.

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