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What causes light rays to bend in a new medium?. . A. change in velocity. b. change in amplitude. c. change in frequency. d. construcutive interference
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What causes light rays to bend in a new medium?. . A. change in velocity. b. change in amplitude. c. change in frequency. d. construcutive interference

User Shep Sims
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its a change in velocity

User David Rees
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A change in velocity is what causes light rays to bend in a new medium. As the light enters the new medium (water for example) the rays bend and their speed is slowed. 
User Jaffer Wilson
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