Measuring grating constant by digital photography and the function of two polarizers

The direction is vertical. Grating constant is measured by digital photography. The function of the two polarizers is that the direction of vibration propagation is perpendicular to the polarization direction of reflected light around the scene, thus preventing the reflected light from entering the camera lens. Digital photography, also known as digital photography or digital photography, refers to the technology of recording images with digital imaging components instead of traditional film.