Ultraviolet light

Ultraviolet light (often abbreviated as UV) is a type of electromagnetic radiation that originates from the sun and is also produced by specialized lights and lasers. UV light is classified into three types based on wavelength: UVA, UVB, and UVC.

Overview

UV light is invisible to the human eye because its wavelength is shorter than that of visible light. The name "ultraviolet" means "beyond violet", referring to its place in the spectrum of light, which is beyond the violet end of the visible spectrum.

Types of UV Light

There are three types of UV light: UVA, UVB, and UVC.

• UVA has the longest wavelength and makes up the majority of UV light that reaches the Earth's surface. It can penetrate deep into the skin and is responsible for immediate tanning. It is also associated with skin aging and wrinkle formation.

• UVB has a medium wavelength. It is partially absorbed by the Earth's atmosphere but the portion that reaches the surface can cause sunburn and play a key role in the development of skin cancer.

• UVC has the shortest wavelength and is almost completely absorbed by the Earth's atmosphere. It is not normally a risk factor for skin cancer. However, UVC light can be produced by artificial sources such as lamps and lasers and can cause harm to skin and eyes upon direct exposure.

Health Effects

Exposure to UV light, particularly UVB, can have both beneficial and harmful effects on human health.

• Beneficial Effects: UVB light is necessary for the production of vitamin D in the skin. This vitamin is essential for bone health, immune function, and other bodily processes.

• Harmful Effects: Overexposure to UV light can lead to skin damage, sunburn, and skin cancer. It can also cause cataracts and other eye conditions.

Protection from UV Light

Protection from UV light is important to prevent skin damage and other health effects. This can be achieved through wearing protective clothing, using sunscreen, and avoiding sun exposure during peak UV times.

See Also

• Sunburn
• Skin cancer
• Vitamin D
• Cataracts

Ultraviolet light Resources
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