How Rainbows Form: Sunlight Refraction in Water Droplets Explained #233173 (License: Personal Use)

This scientific illustration demonstrates the optical process of rainbow formation: a ray of white sunlight enters a spherical water droplet, undergoes refraction at the air-water interface, reflects once off the inner surface, and refracts again upon exiting, separating into its constituent spectral colors. Violet light, with the shortest wavelength, is deviated the most, appearing on the inner edge of the primary bow, while red, with the longest wavelength, is deviated least, forming the outer edge. The diagram clearly labels key components-sunlight input, water droplet, and output spectrum with violet and red extremes-to aid educational understanding.

Used in educational science pages, physics textbooks, meteorology resources, and STEM outreach content to explain atmospheric optics and dispersion. Matches user intent for learning how rainbows form or visualizing light behavior in prisms/droplets.