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10W means 10 joule energy incident in 1 sec.
So, 70% absorption means 7J energy in 1 sec.
Now, momentum transfered=dP = Energy transfered / c
where c = speed of light.
dP = 7 / c
Force = dP/dT
Here dT =1 sec as dP is calculated for 1 sec only.
Force = 7/c = 2.33 x 10 - 8 N
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Moderation Team
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