7. Suppose the intensity of sunlight (solar radiation) at the surface of the earth is 3000 W/m². What force does it exert on a mirror of area 2 m², assuming normal incidence and total reflection of light?
(A) 2 × 10⁻⁵ N
(B) 4 × 10⁻⁵ N
(C) 4 × 10⁻⁴ N
(D) 10⁻⁴ N
(E) 10⁻² N

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