7. The speed of light _______ on entering a medium from vacuum.
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Explanation:
Light travels at approximately 300,000 kilometers per second in a vacuum, which has a refractive index of 1.0, but it slows down to 225,000 kilometers per second in water (refractive index of 1.3; see Figure 2) and 200,000 kilometers per second in glass (refractive index of 1.5).
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Answer:
The speed of light decreases on entering a medium from vacuum.
Explanation:
The speed of light is maximum in vacuum. Therefore, speed of light will always decrease upon entering another medium.
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