SPECTROMETER INTERMEDIATE

Its optical system and features are equivalent to those of advanced model making it still able for senior students to do many quantitative experiments.
Substantial iron casted base with leveling screws, protected graduated disc 150 mm diameter, fixed to table, double ended single vernier reading to 1 minute of arc attached to telescope.
Optics
Telescope : 178 mm focus achromatic objective, 25 mm clear aperture, 8 X Ramsden eye-piece with cross line graticule, rack and pinion focusing.
Collimator
Mounted on fixed pillar and fitted with achromatic object glass 178 mm focus, 25 mm clear aperture, adjustable precision slit, rack and pinion focusing. Prism table with leveling screw and its height is adjustable, surface marked with parallel lines to facilitate leveling of prism. Supplied complete with prism clamp and grating holder, watch makers eye lens to read vernier and tommy bar without prism and gratings. Supplied in beautifully polished wooden case with lock and key.

Accessories

a) Crown glass prism : Equilateral 38 x 38 x 38 mm or 25 x 25 x25 mm as per requirement; Refractive index 1.52, optically worked.
b) Dense flint glass prism : 32 x 32 x 32 mm refractive index 1.62; optically worked.
c) Extra Dense flint glass prisms : 32 x 32 x 32 mm; refractive index 1.65; optically worked.
d) Polariser & Analyser : Polariser and analyser each of 25 mm aperture mounted to fit on to telescope and collimator.
e) Quarter Wave Plate: For sodium light, 20 mm clear aperture, in graduated rotary mount reading to 5° , on a metal stage for use in diffraction grating holder of
spectrometers.
f) Plane Mirror : Silvered both sides, to provide a reflecting surface at the prism table, in metal mount to fit diffraction grating holder.
g) Gauss Eye Piece
h) Diffraction Grating Replica : 13000 tines persq. inch or 6000 lines per sq. inch or as required.