Physics

Problem

Which of the following surfaces is most likely to reflect visible light (average wavelength

\approx 550\,\text{nm}

) diffusely rather than specularly? a) Polished steel with rms surface variation of

5\,\text{nm}

b) Unfinished pine wood with rms surface variation of

50\,\mu\text{m}

c) Satin-finish plastic with rms surface variation of

80\,\text{nm}

d) Frosted glass with rms surface variation of

200\,\text{nm}