When a flashlight submerged in water shines up into the air above, does the speed of light

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When a flashlight submerged in water shines up into the air above, does the speed of light increase or decrease when the light passes from water into the air?
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Chemistry The Central Science

ISBN: 978-0321696724

12th edition

Authors: Theodore Brown, Eugene LeMay, Bruce Bursten, Catherine Murphy, Patrick Woodward

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