<p>Δθ Suppose that you have a reflection diffraction grating with n= 840 lines per millimeter. Light from a sodium lamp passes through the grating and is diffracted onto a distant screen.<br /><br />Two visible lines in the sodium spectrum have wavelengths 498 and 569 . What is the angular separation of the first maxima of these spectral lines generated by this diffraction grating?<br />Express your answer in degrees to two significant figures.<br /><br />-- i got Δθ=3.8 degrees for the answer(WHICH IS CORRECT)<br /><br />but i dont know how to go about answering the second part (the question below is the real question)<br /><br />How wide does this grating need to be to allow you to resolve the two lines 589.00 and 589.59 nanometers, which are a well known pair of lines for sodium, in the second order (m=2)?</p>
<p>Δθ Suppose that you have a reflection diffraction grating with n= 840 lines per millimeter. Light from a sodium lamp passes through the grating and is diffracted onto a distant screen.<br /><br />Two visible lines in the sodium spectrum have wavelengths 498 and 569 . What is the angular separation of the first maxima of these spectral lines generated by this diffraction grating?<br />Express your answer in degrees to two significant figures.<br /><br />-- i got Δθ=3.8 degrees for the answer(WHICH IS CORRECT)<br /><br />but i dont know how to go about answering the second part (the question below is the real question)<br /><br />How wide does this grating need to be to allow you to resolve the two lines 589.00 and 589.59 nanometers, which are a well known pair of lines for sodium, in the second order (m=2)?</p>
