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Echellette Grating (Hughey)

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    290966
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    Name                                                                                                                                      
     

    Echellette Grating.  A diffraction grating has 25,000 grooves uniformly spaced over 25 mm. It is illuminated at normal incidence by white light (380 – 700 nm). Find the angular range of the first-order and second order spectrum produced by the grating.

     

    1. d (m) = _____________________________________

               

    1. Fill out the table below.

      λ, nm

      Color

      λ, m

      (1st order)

      θr (degrees)

      (1st order)

      λ, m

      (2nd order)

      θr (degrees)

      (2nd order)

      400

      violet

      4.00x10-7

      23.6

      4.00x10-7

       

      465

      blue

       

       

       

       

      550

      green

       

       

       

       

      580

      yellow

       

       

       

       

      605

      orange

       

       

       

       

      700

      red

       

       

       

       

     

    1. Sketch an Echellette grating and show how the visible radiation is dispersed according to your calculations in the table above.  Be sure to label ALL aspects of your drawing (e.g., d, θi, θr (λ or color) and n).

     

     

     

     

     

     

     

     

     

     

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