Question

Which of the following will cause regular reflection of light and which diffuse reflection of light?
(a) Polished wooden table
(b) Chalk powder
(c) Cardboard
(d) Mirror
(e) Paper
(f) Marble floor with water spread over it.

Answer 1

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a- polished wooden table- regular reflection since the surface is polished (plane)

b-chalk powder-diffused reflection will occur because the surface of chalk powder is uneven

c- cardboard- diffused reflection of light since cardboard has an uneven surface

d- mirror- regular reflection since the surface of a mirror is plane

e- paper- diffused reflection since the surface of paper is uneven

f- marble floor with water spread over it- regular reflection as the floor with water will behave as a plane surface

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Answer 2

Regular and diffuse reflection of light:

(a) Polished wooden table  = Regular reflection of light

(b) Chalk powder  = Diffuse reflection of light

(c) Cardboard  = Diffuse reflection of light

(d) Mirror  = Regular reflection of light

(e) Paper  = Diffuse reflection of light

(f) Marble floor with water spread over it = Regular reflection of light

Regular reflection of light:

• When the light is reflected from smooth surface, it reflect the light equally and in single direction.
• This makes the light into beam.
• Our eyes cannot see this reflection directly.

Diffuse reflection of light:

• When light is reflected from rough surface, the light is reflected irregularly and in several directions.
• This scatters the light.
• This reflection is used to project picture in cinema theatre.