Light ray
Rainbow
Water droplet
Internal reflection
Answers
Explanation:
light ray is a line (straight or curved) that is perpendicular to the light's wavefronts; its tangent is collinear with the wave vector.
rainbow is a meteorological phenomenon that is caused by reflection, refraction and dispersion of light in water droplets resulting in a spectrum of light appearing in the sky.
drop or droplet is a small column of liquid, bounded completely or almost completely by free surfaces. ... Drops may also be formed by the condensation of a vapor or by atomization of a larger mass of liquid.
Total internal reflection, in physics, complete reflection of a ray of light within a medium such as water or glass from the surrounding surfaces back into the medium. The phenomenon occurs if the angle of incidence is greater than a certain limiting angle, called the critical angle.