Describe the short history of light.

Explanation

The wave theory was not accepted because Newton.s authority and also because light coul travel through vacuum and a wave would alway require a medium to propagate from one poin to the other.
But in 1801, Thomas Young performer interference experiment and firmly establisher that light is a wave phenomenon.
Since the wavelength of the visible light is much smaller than the dimensions of typical mirro and lenses, light can be assumed to approximately travel in straight lines.
The branch of optics in which one completely neglects the finiteness of the wavelength is called geometrical optics.
A ray is defined as the path of energy propagation in the limit of wavelength tending to zero.
Many experiments were carried out involving the interference and diffraction of light waves. These experiments be statisfactorily explained. Thus around the middle of the nineteenth century, the wave theory seemed to be very well established.