| Spectra of Colored LED's | ||
| Description: | The spectra of LED's of different colors can be viewed individually or simultaneously. |
|
| Notes: | The array contains a white LED, as well as colors from 'Deep Red' through 'Violet'. A toggle switch on the back of the tower turns the unit on. A knob at the top of the tower is turned to display each LED individually, or the final setting has all LED's on for comparison of their spectra, as shown below. It should be pointed out to students that the position of the spectrum they see for each color shifts according to the wavelength (color) of that LED. | |
| Location: | LDL-B4. The LED array and its power brick are both in a box. Students will view spectra through the white 2×2 diffraction gratings (found on the same shelf). |
|
| Images: |  LED Array with all LED's turned on |
 View of LED spectra through white 2×2 diffraction gratings |
 Use the white 2×2 diffraction gratings for this demo |
||
|
|
||
| © | St. Lawrence University | Department of Physics |
| Revised: 09 Nov 2018 | Canton, NY 13617 |