A plane e.m. wave of wave intensity 10 W,/m² strikes  a  small minor of area 20 cm², held perpendicular to the
approaching wave. The radiation force on the mirror will be

• A

  $6\cdot 6\times {10}^{-11}\mathrm{N}$

• B

  $1\cdot 33\times {10}^{-11}\mathrm{N}$

• C

  $1\cdot 33\times {10}^{-10}\mathrm{N}$

• D

  $6\cdot 6\times {10}^{-10}\mathrm{N}$