What type of light appears as glare, making it difficult to see?

Glare is typically associated with light that is too bright or intense, making it difficult for the eyes to adjust and see clearly. Plane polarized light can cause glare because it can be reflected off surfaces like water, roads, or glass, creating concentrated brightness that hampers visibility. When light becomes plane polarized, it oscillates in a specific direction, and when it hits a reflective surface, it can enhance visibility issues, leading to discomfort and hindered visibility.

In contrast, infrared light is not visible to the human eye, so it doesn't contribute to glare. Direct sunlight can certainly cause glare, but it encompasses a broader spectrum of light that doesn't specifically relate to the polarization aspect. Ultraviolet light, while it can be present in sunlight and can affect vision over time (such as contributing to cataracts), it does not directly cause glare in a typical sense. Thus, plane polarized light stands out as the type known for its tendency to produce glare under certain conditions.