The lift generated is solely due to the radiation pressure from the laser.
The paper is held stationary and does not move due to air currents or other external factors.
The laser beam is perfectly collimated and does not diverge over the distance to the paper.
The entire mass of the paper (A4 size, which typically weighs about 5 grams) is utilized for lift generation.
Given:
Mass of paper (m) = 5 g (0.005 kg)
Lift generated (F) = 10 g (0.01 kg)

Using the formula for force (F) in terms of power (P) and speed of light (c):
F = P/c

Rearranging the formula to solve for power (P):
P = F * c

Substituting the values:
P = 0.01 kg * 299,792,458 m/s (speed of light in vacuum)

Calculating the power of the laser:
P = 2,997,924.58 Watts or approximately 2.998 MW (megawatts)

So, a laser with a power output of approximately 2.998 MW would be required to generate enough lift to make an A4 sheet of paper fly, assuming the given assumptions and conditions.
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