differenciate btw UV-A and UV-B
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The Difference Between UVA and UVB Rays. The sun emits two types of ultraviolet (UV) radiation that reach our skin: ultraviolet A (UVA) and ultraviolet B (UVB). ... All light rays, including UVA and UVB rays, have different wavelengths, measured in nanometers, or “nm” for short.
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UVA rays penetrate deep into the dermis, the skin's thickest layer. Unprotected exposure can lead to premature skin aging and wrinkling (photoaging), and suppression of the immune system. UVB rays will usually burn the superficial layers of your skin. It plays a key role in the development of skin cancer.
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