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Q. Which optical device is used with a spectrometer to measure the wavelength of a given monochromatic light??

Q. Which optical device is used with a spectrometer to measure the wavelength of a given monochromatic light?? 

Grade:11

1 Answers

Saurabh Kumar
askIITians Faculty 2411 Points
6 years ago
A spectrophotometer is that device that consists of two instruments, namely a spectrometer for producing light of any selected color (wavelength), and a photometer for measuring the intensity of light. The instruments are arranged so that liquid in a cuvette can be placed between the spectrometer beam and the photometer. The amount of light passing through the tube is measured by the photometer. The photometer delivers a voltage signal to a display device, normally a galvanometer. The signal changes as the amount of light absorbed by the liquid changes.

If development of color is linked to the concentration of a substance in solution then that concentration can be measured by determining the extent of absorption of light at the appropriate wavelength. For example hemoglobin appears red because the hemoglobin absorbs blue and green light rays much more effectively than red. The degree of absorbance of blue or green light is proportional to the concentration of hemoglobin.

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