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.