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The flame of a candle is a source of light.
The source of natural white light is the sun.
Electricity is the source of energy in a light bulb.
A mirror is not a source of light, natural or otherwise.
The term "Spectrophotometry" refers to an instrument that is often used to determine the intensity of the various wavelengths in a spectrum of light. This tool is a part of analytical chemistry.
For example UV-VIS absorption spectrophotometry.
There is no such thing as photospectrometry. It's sometimes used when actually meaning spectrophotometry. This usage is incorrect.
spectrophotometry is a branch of spectroscopy dealing with measurement of radiant energy transmitted or reflected by a body as function of wave lenght %
Blank Sample in Spectrophotometry is used to measure the absorbance of light without sample. It is subtracted from the total absorbance for measurement of Absorbance from a sample's absorbance.
It is a light source.
By chemical analysis: Uv-vis absorption spectrophotometry, atomic absorption spectrophotometry, inductively coupled plasma mass spectrometry, inductively coupled plasma emmission spectrometry, polarograhy, phosphorescence fluorometry, flame spectrophotometry, etc.
The Sun is a light source Something that makes light.
It is certainly a source of light but it is not a practical, usable source.