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The Balmer series is a set of discrete emission spectral lines of the Hydrogen atom. The diffractive grating is used to disperse the collimated beam of hydrogen deuterium lamp, and the diffractive angle of Balmer series line is measured by digital protractor and telescope. The experimental value of Rydberg constant is derived from the wavelength.
Specifications
| Item | Specifications |
| Hydrogen-Deuterium Lamp | Wavelengths: 410, 434, 486, 656 nm |
| Digital Protractor | Resolution: 0.1° |
| Condensing Lens | f = 50 mm |
| Collimating Lens | f = 100 mm |
| Transmissive Grating | 600 lines/mm |
| Telescope | Magnification: 8 x; diameter of objective lens: 21 mm with internal reference line |
| Optical Rail | Length: 74 cm; aluminum |
Part List
| Description | Qty |
| Optical rail | 1 |
| Carrier | 3 |
| X-translation carrier | 1 |
| Optical rotation stage with digital protractor | 1 |
| Telescope | 1 |
| Lens holder | 2 |
| Lens | 2 |
| Grating | 1 |
| Adjustable slit | 1 |
| Telescope holder (tilt adjustable) | 1 |
| Hydrogen-Deuterium lamp with power supply | 1 set |
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