A photometer when placed in a blank in light path provides a reading of 700 mV and 170 mV when it was replaced by an absorbing solution. Calculate: a) % transmittance and absorbance of the absorbing solution. b) Transmittance when the concentration of absorber is one half of the original solution. c) Transmittance when the light path through the original solution is doubled.

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UV Visible Spectroscopy

Spectroscopy refers to the absorption or emission of light or other radiations by matter. When a substance or chemical absorbs light or radiation, they reach an excited state followed by de-excitation or emission of the light or radiation forming distinct spectra. UV-visible spectroscopy or  ultraviolet-visible refers to the absorption and emission in the ultraviolet and visible regions of the electromagnetic spectrum.