Question

why do we take readings on two different windows of a spectrometer?​

Answer 1

Answer:

Double beam spectrophotometers operate faster and provide more reproducible results because they perform an automatic correction for the loss of light intensity as the beam passes through the sample and reference solution.

Answer 2

Explanation:

Double beam spectrophotometers operate faster and provide more reproducible results because they perform an automatic correction for the loss of light intensity as the beam passes through the sample and reference solution.

• In order to take a reading of the angle at which the spectrometer is set, do the following:
• Take a reading from the main scale: read the number opposite the marking "0" on the vernier scale. ...
• Take a reading from the vernier scale, which gives the number of arcminutes away from the half-degree determined above.