Question

Differentiate between regular and diffused reflection.

Answer 1

regular mean that light ray which fall on smooth surface and is reflected parallel
It can be seen from fixed direction

diffused or irregular mean light ray which fall on rough surface and is reflected irregularly in all direction and can be seen by all direction. This light ray enable to see the world

Answer 2

Regular reflection :
Occurs from shiny and smooth surfaces.
Reflected rays are parallel to each other.

Diffused(irregular) reflection:
Occurs from unpolished & rough surfaces.
Reflected rays are not parallel to each other.

Hope it helps!!