What is an Electromagnetic Wave? Video Lessons

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Problem: The sun is 1.5 × 10 8 km from Earth. The index of refraction for water is 1.263.  How much longer would it take light from the sun to reach Earth if the space between them were filled with water rather than a vacuum?

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The sun is 1.5 × 10 8 km from Earth. The index of refraction for water is 1.263.  How much longer would it take light from the sun to reach Earth if the space between them were filled with water rather than a vacuum?

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What scientific concept do you need to know in order to solve this problem?

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