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Refractive Index MCQs App Download - Class 7 Science Apps (Android & iOS)

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Refractive Index MCQs App Download & e-Book PDF - 764

MCQ: 764

The speed of light in water is

  1. Two-quarters of light speed in vacuum
  2. Three-quarters of light speed in vacuum
  3. one-third of light speed in vacuum
  4. two-third of speed of light in vacuum

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