Compute all parts of given question:

Question: A helium-neon laser with wavelength 632.8 nm produces a beam of diameter 1.75 mm and delivers 2.00 x 10¹⁸ photons/s.

Part A: What is the power output of this laser?

Part B: Calculate the amplitudes of the electric fields and the magnetic fields inside the beam.

Part C: If the beam shines perpendicularly onto a perfectly reflecting surface, what force does it exert on the surface?

Part D: The beam is absorbed by a block of ice at 0°C for 1.50 h, what mass of ice melts? (Lice = 3.33 x 10⁶ J/kg).

Please provide correct answer for above question.