Question

One of the dispersive components of an optical instrument is a 0.750-meter focal length monochromator equipped with the same grating used in part (a). The grating measures 80 mm x 80 mm. Using the line/mm number calculated (a) find the first-order reciprocal linear dispersion, D-1, (in nm/mm) for this monochromator.

Answer 1

Answer: (a) 1.11 nm/mm

Explanation:

Monochromator is a device which is used to transmits a delectable band of wavelengths of light wavelengths available at the input.

Assuming focal length monochromator equipped with a 1200-groove/mm grating

The formula for the first-order reciprocal linear dispersion is

`D^(-1) = d/n*F` where F is the focal length and n belongs to order of the first spectra.

`D^(-1) = ((1/1200) mm * 10^6 (nm/mm)/)/(1 * 0.75 m * (103 mm/m) ) = 1.11 nm/mm`

Make sure you have used the conversion factors correctly as it will have a major impact on the calculation of the answer.