Geometrical optics depicts light spread as far as beams. In geometrical optics the light rays follow curved paths in a medium in which the refractive index changes and may be reflected. Geometrical optics does not account for certain optical impacts like diffraction and obstruction. Geometric optics makes rays travel in straight lines until they hit a surface. At the point when the ray encounters a surface it can either reflect or bend but then continues to travel in a straight line.