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Direction changes depend on the boundary geometry - Paper 1

Read the information, then answer the questions. An adult may read the instructions aloud. Show your working where asked.

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Supplied ray diagram in words: a ray enters a slower medium; incidence angle is 20 degrees and refraction angle 12 degrees, BOTH measured from the normal. The normal is perpendicular to the boundary. Use these given angles, not an assumed drawing scale; no laser or bright-light experiment is requested.

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