Can light penetrate deep into our skin?

Yes, light can penetrate deep into our skin, but its ability to do so varies depending on the wavelength of the light. Short wavelength light, such as blue, green, or ultraviolet light, does not penetrate tissues very easily and typically affects only the surface layers of the skin. In contrast, long wavelength light, like red light and near-infrared light, has the capacity to penetrate deeper through skin layers, potentially reaching as deep as the bone and bone marrow. This difference in penetration is due to the varying absorbance properties of the skin in relation to different light wavelengths 1.