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Q. What is the name of the phenomena (driven by the scattering of light) in which mountain tops acquire a rosy or orange hue around sunrise and sunset?
1. Circle of confusion
2. Barrel distortion
3. Brillouin scattering
4. Alpenglow

The answer to this question is (4) Alpenglow. Few facts about Alpenglow - It occurs when red light waves in sunlight reflect off of mountains back to an observer. There are two stages of Alpenglow, it can be caused by direct or indirect sunlight. It is an optical phenomenon that occurs just before sunrise or just after sunset.