Spectrometry Kit

The working of a spectrometer is based on the principle that when light falls on an optical device such as a prism or diffraction grating each wavelength is refracted or bent by a unique angle. A precise spectrum can be determined by measuring the angles at which light is refracted or bent.

Features:

• Main scale & Vernier scale are made of Brass on CNC machine.
• Two Vernier used to remove eccentric error.
• Least count 1 min. for measurement.
• Highly stable spectrometer body (weight 6 kg approx.).
• Supplied in black wooden box.
• Adjustable optical arms to coincide axis of collimeter & telescope.
• Optics aperture 32 mm for better resolution.

Learning Objectives/experiments

• To determine the dispersion & resolving power of the prism.
• To determine the wavelength of sodium light & also determine resolving power of using a diffraction grating.
• To determine angular dispersive by grating or prism.
• To determine the refractive index of prism.
• To determine wavelength of mercury spectral lines (optional).
• To verify Cauchy’s equation (using Mercury light source).To draw graph
  (i) between wavelength ( λ) and minimum 2derivation angle.
  (ii) between 1/ λ and minimum angle for prism for various lines from the spectrum of mercury discharge source.

Technical Data:

• Main scale : Brass, dia. 150mm, 0 – 360 ,1 MSD ½
• Least count : 1 minute
• Objective : Achromatic lens, F = 178mm, Ø 32mm
• Slit : Brass with knurled screw
• Reticle : 90 cross etched on glass, Ø 21mm
• Eyepiece : 15X, Ramsdens, 22 x 23mm (LxØ)
• Vernier : Brass, 2 verniers (for optical arms) L = 40mm
• Base : 175mm dia., Aluminum casting
• Prism : Arms (32 x 32 x 32mm), Height 32mm, Refractive Index 1.65
• Micrometer slit : Range 0 – 3mm, LC 0.01mm
• Wooden box : 400 x 320 x 315mm
• Lamp house : MS, 200 x 85mm (LxØ), Aperture (LxW) 20 x 16mm
• Grating : 50 x 38mm, 15,000 lines/ inch

Scope of Delivery:

• 1 Intermediate spectrometer
• 1 Sodium light source
• 1 Prism
• 1 Diffraction grating
• 1 Micrometer slit
• 1 Eye Magnifier
• 1 Spectrometer wooden box
• 1 Mercury light source (Optional)
• 1 Allen key