Fluorescence occurs when a substance emits light after absorbing light or other electromagnetic radiation of a different wavelength. Thus, the correct option is C.
Electromagnetic radiation may be defined as a type of radiation that includes all possible kinds of radiation such as X-rays, gamma rays, radio waves, etc that consists of varied electric as well as the magnetic field.
Fluorescence may be defined as the process of emission of light by a specific substance that has initially absorbed light through the means of electromagnetic radiations. It is also known as luminescence.
The light that has been emitted by substances may be of a longer wavelength or shorter wavelength depending on the frequency of that radiation.
Therefore, Fluorescence occurs when a substance emits light after absorbing light or other electromagnetic radiation of a different wavelength. Thus, the correct option is C.
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