Question

what is the difference between regular and diffused reflection

Answer 1

regular reflection-
◆occured in smooth surface
◆angle i= angle r

diffused reflection-
◆ occurred in rough surface
◆angle i is not equal to angle of reflection.

Answer 2

1) When a parallel beams of light fall on a regular and they are reflected back in parallel form,then it is said to be regular reflection.
When a parallel beams of light fall on a irregular and they are reflected back not in parallel form,then it is said to be irregular reflection.

2) Regular reflection happens only in regular surface.
Irregular reflection happens on irregular surface.

Hope this will help you.