A spectrometer uses a specific light source and a grating that has a specification of 200/mm to split the light (find the distance between gap/lattice).  The diffraction pattern seen on the screen is a colored fringe pattern like a rainbow.   (b) If the angle formed is between the first light and the reference angle is 25°, what is the wavelength the light source?

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A: please see the next step for solution

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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.