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Light — Science STD 8 — Question

Gujarat BoardEnglish MediumSTD 8ScienceLight3 Marks
Question
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 spread over it
(e) Mirror
(f) Piece of paper
✓

Answer

(a) Polished wooden table As the surface is smooth, so there is a regular reflection through it.
(b) Chalk powder Since, the surface is not smooth or it is uneven, thus there is a diffused reflection through it.
(c) Cardboard surface As its surface is uneven, so it will produce a diffused reflection.
(d) Marble floor with water spread over it As marble floor itself is very smooth, besides this there is a layer of water on it which makes the surface regular for reflection.
(e) Mirror Since, the surface of mirror is smooth, thus it will produce a regular reflection.
(f) Piece of paper Since, the surface is uneven, thus it will produce a diffused reflection.

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