Mention against each of the following whether regular or diffused reflection will take place when a beam of light strikes. Justify your answer in each case. (a) Polished wooden table (b) Chalk powder (c) Cardboard surface (d) Marble floor with water (e) Mirror (f) Piece of paper

Regular reflection occurs at perfectly smooth surfaces and diffused reflection occurs at rough surfaces
(a) Polished wooden table: Regular reflection since the surface is relatively smooth.
(b) Chalk Powder: Diffused reflection since the surface of chalk powder is very rough.
(c) Cardboard surface: Diffused reflection since the surface of cardboard is rough.
(d) Marble floor with water: Diffused reflection since the surface of water is not perfectly even, and the marble itself may have some roughness.
(e) Mirror: Regular reflection since the surface of a mirror is smooth.
(f) Piece of paper: Diffused reflection since the surface of paper is rough.