Mystery #1Tier 2laser light
How is a laser beam so different from the light of an ordinary torch?
Switch on a torch and the light floods out in a wide, soft pool that fades as it goes. Switch on a laser pointer and you get one sharp dot, tiny and bright, even right across the room. Both are only light, so why do they behave so differently? How is a laser beam so different from the light of an ordinary torch?
Your guess
What do you think makes a laser beam stay such a tight, neat dot?
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