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Light — Science STD 8 — Question

Gujarat BoardEnglish MediumSTD 8ScienceLight4 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

Polished wooden table: Regular reflection Polishing a wooden table will smooth its surface and will have no irregularities. Hence, regular reflection will take place.
Chalk powder: Diffused reflection Chalk powder when spread on a surface will result in an irregular surface. Hence, diffused reflection will take place.
Cardboard surface: Diffused reflection Cardboard surface is an irregular surface. Hence, diffused reflection will take place.
Marble floor with water spread over it: Regular reflection Marble floor with water makes the marble a smooth surface. Hence, regular reflection will take place.
Mirror: Regular reflection Mirror is an example of smooth surface. Hence, regular reflection will take place.
Piece of paper: Diffused reflection A piece of paper is an example of irregular surface. It might look smooth, but there are many irregularities present on its surface. Hence, diffused reflection will take place.

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