We can't live without sunshine. Generally, we think that sunlight is a monochromatic light (light with a single wavelength). In fact, the light around us is polychromatic light (light composed of two or more monochromatic lights), which is composed of monochromatic lights with different wavelengths.

Broadly speaking, diffraction screens with periodic spatial structure or optical properties (such as transmittance and refractive index) are collectively called gratings. There are many kinds of gratings, such as transmission grating and reflection grating, plane grating and concave grating, black-and-white grating and sine grating, one-dimensional grating, two-dimensional grating and three-dimensional grating.

The grating used in this experiment is a holographic transmission grating shot by holographic technology. If the grating surface is not easy to clean after being polluted, special attention should be paid when using it. Spectrometer is an optical instrument that can accurately measure angles. It is often used to measure the refractive index, dispersion rate, wavelength of light wave and spectral observation of materials.

Because the equipment is precise and has many complicated control parts, it must be adjusted in strict accordance with certain rules and procedures in order to measure accurate results. Absrtact: Spectrometer is a typical optical instrument that can accurately measure the refraction angle. It is often used to measure the refractive index, dispersion rate, wavelength of light wave and spectral observation of materials.

Because of the precision, many control parts and complicated operation, the device must be adjusted strictly according to certain rules and procedures to obtain high-precision measurement results.