When 400-nm red light is incident on a vertically oriented diffraction grating that is 3.2 cm wide, a fourth-order maximum is observed on a vertical screen at 300 from the horizontal line that connects the grating to the screen. How many total lines are on the grating

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Diffraction of light

In physics, the term diffraction is defined as the bending of light around the corners of the obstacle. As a light ray passes by an aperture, it bends around the edges or through slits, it spreads out through a narrow opening. The diffracted light will produce fringes of bright and dark or colored bands which are labeled as a diffraction pattern.