A simple design of a spectrometer is suggested to measure the reflectance of plane specularly reflecting surfaces at normal / near normal incidence. Spectral energy distribution of reflectance of samples can be recorded by this instrument. The division of incident radiation beam into the sample and the reference beams facilitates to overcome the difficulty arising due to source fluctuations. The performance of experiment in two Steps helps effectively to obviate the effects because of (i) difference in path lengths of the sample and the reference beams, (ii) polarization produced by optical components, and (iii) stray light etc. The use of two integrating spheres attached with separate detectors facilitates the setting of the beam splitters not so critical. The uncertainty with the measurement is reduced as the square of the reflectance is measured.
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