A spectrum of the Suns radiation in the infrared region is produced by a grating. What is

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A spectrum of the Sun’s radiation in the infrared region is produced by a grating. What is the wavelength being studied if the infrared line in the first order occurs at an angle of 25.0° with the normal and the fourth-order image of the hydrogen line of wavelength 656.3 nm occurs at 30.0°?

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