Ultravioletne

Ultravioletne, also known as ultraviolet radiation, is a form of electromagnetic radiation with wavelengths shorter than visible light but longer than X-rays. It is invisible to the human eye but can be detected by some insects, such as bees, which use it for navigation. Ultraviolet radiation is categorized into three types based on its wavelength: UVA (315-400 nm), UVB (280-315 nm), and UVC (100-280 nm). UVC is the most energetic and is almost entirely absorbed by the Earth's atmosphere, making it harmless at ground level. UVB is the primary cause of sunburn and skin cancer, while UVA is responsible for skin aging and wrinkles. Exposure to ultraviolet radiation can also cause eye damage, such as cataracts and pterygium. To protect against harmful UV radiation, people often use sunscreen, wear protective clothing, and seek shade. The ozone layer in the Earth's stratosphere plays a crucial role in absorbing most of the sun's UV radiation, helping to protect life on Earth.