If 2.5 \times 10^{-6} N average force is exerted by a light wave on a non - reflecting surface of 30 cm2 area during 40 minutes of time span, the enrgy flux of light just before it falls on the surface is ______ W/cm2 . (Round off to the Nearest Integer) (Assume complete absorption and normal incidence conditions are there)
Option: 1 25
Option: 2 30
Option: 3 35
Option: 4 40

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