Lab equipment

Lenses

	Type	Focal length	Diameter	Height of center
Telescope lens	Achromatic air spaced doublet	1200 mm	150 mm	~163.5 mm
Collimator lens	Achromatic doublet	1827 mm	203 mm	~163.5 mm
Imaging lens	Achromatic air spaced doublet	1200 mm	150 mm	~163.5 mm
Singlet lens	Thin singlet lens	~300 mm	~50 mm
Doublet lens	Thick achromatic doublet lens, focal length written on edge	~100 mm	~50 mm
Doublet lens	Thick achromatic doublet lens	~300 mm	~50 mm
Compound lens	For illustration of coma		~50 mm
Compound lens	For illustration of transversal chromatic aberrtion, aperture at rear end		~50 mm
Barrel lens	Missing screw thread in middle, focus ~5 mm behind		~2.2 mm

Light sources

Lasers

Laser: connected with fiber

• Description: laser connected with fiber to collimator tube.
• Class: IIIb (3B), 5 mW. Note: when used with the collimator tube the effective output is below class II, i.e. no risk for the eye.
  
• Wavelength: 635 nm.

Laser: stick

• Description: black, long thick stick, He-Ne laser.
• Class: II, 0.95 mW.

Laser: small tube

• Description: small laser powered by 4.5 V flat battery.
• Class: IIIa (3R), about 4.5 mW.

White light ray emitter

• Description: white light ray emitter connected to collimator tube.
• Wavelength: 360-1700 nm.
• Stabilization time: 5 min.

Spectral lamp

• Types of bulbs: neutral helium (He I) and neutral neon (Ne I).
• He I lines should be easy to find:

Color	Wavelenght (Å)	Comments
Red	6678.15
Yellow	5875.6	Double lines (5875.6148 and 5875.6404 Å)
Turquoise	5015.68
Blue	4921.93
	4713.2
	4471.5

• Note: from the spectra given by the manufacturer, one should also be able to see a red double line at 7065.3 Å and a violet line at 3888.65 Å. However, a picture with long exposure time will have to be taken in order to see them and the latter will still be extremely weak.