A parallel beam of $$6.0\,\text{mW}$$ radiation of wavelength $$200\,\text{nm}$$ and of area of cross-section $$1.0\,\text{mm}^2$$ falls normally on a plane metallic surface. If the radiations are completely reflected, the pressure exerted by the radiations on the metallic surface is estimated to be

A

$$1\times10^5\,\text{Pa}$$

B

$$2\times10^5\,\text{Pa}$$

C

$$2\times10^{-5}\,\text{Pa}$$

D

$$4\times10^{-5}\,\text{Pa}$$