The force on a hemisphere of radius $1\, cm$ if a parallel beam of monochromatic light of wavelength $500\, nm$. falls on it with an intensity of $0.5\, W/cm^2$, striking the curved surface in a direction which is perpendicular to the flat face of the hemisphere is (assume the collisions to be perfectly inelastic)

  • [AIIMS 2009]
  • A

    $5.2\times10^{-13}\, N$

  • B

    $5.2\times10^{-12}\, N$

  • C

    $5.22\times10^{-9}\, N$

  • D

    zero

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