Which acts as a good absorber: Black polished surface or Black rough surface.

Surface tension acts

What acts as a perfect black body in Fery's perfect, black body?

Choose the correct alternative and write it along with its allotted alphabet: Which of the following is the requirement for regular reflection of sound? A. smooth surface B. Rough surface C. Vacuum D. Transparent rough surface

Assertion: By roughening the surface of a glass sheet its transparency can be reduced. Reason: Glass sheet with rough surface absorbs more light.

Assertion: By roughening the surface of a glass sheet its transparency can be reduced. Reason: Glass sheet with rough surface absorbs more light.

Give scientific reasons : The ramp on the railway station has a rough surface.

Right or wrong . If wrong , write the correct sentence : The reflection of light rays in irregular reflection is obtained due to the irregular/rough surface .

Answer the following : Figure (I) and (II) show three parallel rays , shown in black , incident on smooth and rough surfaces . The reflected rays are drawn using laws of reflection shown in colour : Rays reflected from which surface are parallel to one another ? :

Complete the analogy : Smooth surface : Regular reflection of light :: Rough surface : ………….

Answer the following : Figure (I) and (II) show three parallel rays , shown in black , incident on smooth and rough surfaces . The reflected rays are drawn using laws of reflection shown in colour : What conclusion can you draw from the figure ? :