Q.3 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 - Regular reflection

A polished surface is an example of a smooth surface, so a polished wooden table has a smooth surface. Hence, reflections from a smooth surface will be regular.

(b) Chalk powder - Diffused reflection

Chalk power spread on a surface is an example of an irregular surface. As the surface is not smooth, therefore diffused reflection will take place from chalk powder.

(c) Cardboard surface - Diffused reflection

Cardboard surface is also an example of an irregular surface. Hence, diffused reflection will take place from a cardboard surface.

(d) Marble floor with water spread over it - Regular reflection

Marble floor with water spread over it is an example of smooth surface. This is because water makes the marble surface more smooth. Hence, regular reflection will take place from this surface.

(e) Mirror - Regular reflection

Mirror has a smooth surface. Hence, regular reflection will take place from this surface.

(f) Piece of paper - Diffused reflection

Though a piece of paper looks smooth, but it has many minute irregularities on its surface. Due to this diffused reflection will take place from this surface.

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