Question

Which of the following actions performed on a rough metal surface significantly increases the proportion of incident light that undergoes specular reflection?1) Matte finish painting2) Polishing3) Etching4) Sand blasting

Answer 1

2) Polishing

Explanation:

Specular reflection occurs only when the reflecting surface is not rough on the wavelength scale of light. Polishing a surface significantly increases the proportion of incident light that is specularly reflected.