Diffraction grating: to determine the wavelength of laser

Which of the following is the purpose of using a diffraction grating in the experiment?
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Which of the following color deviate the most in case of grating?
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How is grating element related to the number of ruling per cm?
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In a diffraction grating experiment, if the distance between the grating and the screen remains the same while the laser is replaced with another laser of different wavelength, what will happen to the interference pattern?
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What is the condition for constructive interference as a consequence of diffraction?
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