Microscopic Domain
Microscopic domain includes phenomena at minuscule scales like atomic , molecular and nuclear . It also deals with interaction of probes like electrons , photons and other elementary particles . Quantum theory has been developed to handle these phenomena .
Factors responsible for progress of Physics
o Quantitative analysis along with qualitative analysis . o Application of universal laws in different contexts .
o Approximation approach ( complex phenomena broken down into collection of basic laws ).
o Extracting and focusing on essential features of a phenomenon .