Force exerted on mirror by laser beam

  • #1
cantdophysics
2
0
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?
kthx
 

Answers and Replies

  • #2
Doc Al
Mentor
45,462
1,951
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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