A 32500-line-per-centimeter grating will not produce a maximum for visible light, because the slits are too close together. Part (a)  What is the longest wavelength, in nanometers, that will produce a first-order maximum from this grating?   Part (b)  What is the greatest number of lines per centimeter a diffraction grating can have and produce a complete second-order spectrum for visible light? Assume the longest wavelength for visible light is 700 nm

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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.