Which color of light is refracted the least during a sunset?

During a sunset, red light is refracted the least because it has a longer wavelength compared to other colors of light, such as blue and green. Refraction occurs when light passes through different mediums and bends due to changes in speed. Shorter wavelengths, like blue and green, refract more significantly because they encounter greater changes in speed as they move through the atmosphere, especially when the sun is near the horizon.

During sunset, the light from the sun passes through a thicker layer of the Earth's atmosphere, scattering shorter wavelengths (blue and green) more efficiently than the longer wavelengths (red and yellow). As a result, the blue and green light is scattered out of the direct path of sight, allowing the longer wavelengths, such as red, to dominate the spectrum of light that reaches an observer. This phenomenon is part of what gives sunsets their vibrant red and orange hues, while minimizing the visibility of the blue and green light.