Infrared, microwaves, radio waves are the examples for this type of radiation. Because of very low level of photon energy it is not possible to change the atomic or molecular structure of the materials that are exposed to this type of radiation, which is known as non-ionizing radiation. Some effects of electromagnetic waves that are dependent on frequency include visibility and penetration and heating of materials and tissue. Some properties apply across the spectrum, for example, energy from radiation source diminishes as a function of distance squared. Heat most easily effects certain tissue, like that of the eye because the eye has little blood circulation and little ability to remove heat through blood movement.
Tissue absorbs some wavelengths, but for other wavelengths, tissue is essentially transparent.
The depth of penetration for absorbed wavelengths varies as well. Figure 3 shows the general absorption properties of the eye for electromagnetic radiation. General absorption properties of the eye for electromagnetic radiation. Electromagnetic radiation Does not ionize atoms Does not break down the molecules into their elements Even though the energy level of non-ionizing radiation photons does not affect the molecular structure, it can harm biological tissue by producing high levels of heat. You may find more detailed information on electromagnetic radiation by clicking here.