Higher Physics Lab Light & Optics



Exp-1 To determine the refractive index of the material of prism using sodium light.
Exp-2 To determine the dispersion power of a prism.
Exp-3 To determine the resolving power of the prism.
Exp-4 To determine the wavelength of sodium light using a plane diffraction grating.
Exp-5 To determine the resolving power of a plane diffraction grating.
Exp-6 To verify Cauchy’s equation (Mercury light source required).

  • Refractive Index.
  • Resolving power.
  • Dispersion.
  • Prism.
  • Diffraction grating.

Principle and Working :

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.


Cat No. Item Name SK024 SK001 SK070
SL806 Advanced spectrometer 1    
SL448 Intermediate spectrometer   1  
SN583 Spectrometer-Goniometer     1
SL930 Sodium light source 1 1 1
SW915 Prism 1 1 1
SL795 Diffraction grating 1 1 1
SL439 Micrometer slit 1 1

Light & Optics Experiments