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Homework Help: Force exerted on mirror by laser beam

  1. Nov 18, 2003 #1
    How much force (in Newtons) is exerted on a mirror when a 12.0W laser beam of red light (675 nm) strikes the mirror normal to its surface? (Assume no light is absorbed)

    How how how how???
  2. jcsd
  3. Nov 19, 2003 #2

    Doc Al

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    Staff: Mentor

    Hint: how would you solve the problem of a rubber bullet bouncing off a wall? Think Impulse = Force x Time = change in Momentum.

    Does light have momentum?
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