Question

The reflection taking place from the walls of a building is called:
A) regular reflection
B) diffused reflection
C) multiple reflection
D) internal reflection

Answer 1

Hint
Due to the coarse surface of walls the light rays get reflected at different directions and are scattered. The reflected rays are not parallel to each other. Light rays get reflected and many angles unlike regular reflection and hence are called diffused reflection.

Complete step-by-step answer
Diffused reflection is a type of reflection where the light rays which are incident on the surface are from different directions in straight lines. These rays when incident on the surface they get scattered in different directions. The reflected rays are not parallel to each other. Diffused reflection takes place when the surface is coarse.

This kind of diffused reflection takes place on walls of buildings as the surface is coarse. As there is more incident light after diffused reflection each incident ray is scattered into reflected rays at many angles and different directions unlike regular reflection.
The correct option is B.

Note
Regular reflection is where a light ray obeys the laws of reflection and for each incident ray there exists a reflected ray with angle of incidence equal to reflection.

Multiple reflection is a type where the same light ray suffers more than one reflection as in light between two parallel mirrors.

Internal reflection takes place when the light ray is travelling from denser medium to rarer medium which angle of incidence greater than the critical angle for that pair of media.