The bending of light because of a speed change as it moves from one medium to another is called

a. diffraction.
b. refraction.
c. reflection.
d. the Doppler effect.


b

Physics & Space Science

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Is this a photo of a spiral galaxy or an elliptical galaxy, and how do you know?

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Orion is visible on winter evenings in the northern hemisphere but not summer evenings because of

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Physics & Space Science

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Physics & Space Science