For courses in health and physical education, expenses for supplies are qualified expenses only if related to athletics. This deduction is for expenses paid or incurred during the tax year. You claim the deduction on line 23 of Form 1040 (PDF) or line 16 of Form 1040A (PDF).
In astronomy, the term spectrophotometry refers to the measurement of the spectrum of a celestial object in which the flux scale of the spectrum is calibrated as a function of wavelength, usually by comparison with an observation of a spectrophotometric standard star, and corrected for the absorption of light by the Earth's atmosphere.
A spectrophotometer measures the intensity of a light beam before and after it passes through a sample and compares these two intensities. The Spec 20 reports two types of measurements: percent transmittance and absorbance.Percent transmittance is the ratio of the intensity of the light passing through the sample to the intensity of the light shining on the sample multiplied by 100%.Absorbance is the log of the transmittance. The Spec 20 can measure absorbance and transmittance over a range of wavelenghts.You must select a wavlength and calibrate the instrument at that wavelength before making any measurements.bsorbance is the log of the transmittance. The Spec 20 can measure absorbance and transmittance over a range of wavelenghts. You must select a wavlength and calibrate the instrument at that wavelength before making any measurements.