Age of universe

cosmology is the science of universe and large scale structure of it.it begin in studies extensively by the begining of the 20th centuary by Albert einstien. the general theory of relativity which had sufficient ideology to construct mathematical models of the universe. and it given strong base by Edwin hubble’s own measurements of hus constant.

FUNDAMENTAL THEORIES OF LIGHT

Physical optics is a branch of optics which deals with nature of light, mechanism of its production, emission and propagation through space. It deals with the phenomenon of Interference, Diffraction and Polarization of light. From the experimental observations, it is evident that light is form of energy. There are two methods of transfer of energy. (i) by stream