Higher Physics Lab Light & Optics



Exp-1 To demonstrate Young’s fringes.
Exp-2 To demonstrate diffraction pattern by pinhole, single slit, double slit & grating.
Exp-3 To demonstrate Fresnel’s diffraction.
Exp-4 To determine the slit or pinhole width.
Exp-5 Light spreads when passed through a narrow aperture.
Exp-6 To measure wavelength using a millimeter scale as a grating..

  • Pen type diode laser operated by two “AAA”cells.
  • Power of laser <1 mw.
  • Steel U-shaped bench.
  • Same holder may be used for lens or diffraction slit.
  • Big screen provides clear observation of fringes.
  • Diffraction.
  • Fresnel diffraction.
  • Fraunhofer diffraction
  • Interference.
  • Wave-particle.
  • Fringes of equal inclination.

Principle and Working :
Diffraction phenomenon of light can be observed when a laser beam passes through a slit or grating. The diffraction pattern can be observed on a translucent screen.
In the present setup, a single slit, double slit, multiple slit,single tapered slit, fine grating, holes, circular opaque spot, gray filter, mesh and coarse grating are used for diffraction experiment with diode laser.


Cat No. Item Name SA006 SN611
C4941 Diode laser with holder 1 1
C7296 Optical bench 1 1
C1734 Object screen with clip 1 1
R5199 Set of 13 objects 1  
SL744 Diffraction slides   1
C4910 Slit holder 1 1
SN938 -10 cm bi concave lens in holder 1 1
SN937 -5 cm bi concave lens in holder 1 1
SN931 +10 cm bi convex lens in holder 1 1
SN934 +20 cm bi convex lens in holder 1 1
C0487 Prism table 1 1
SP124 Measuring tape (3 m) 1 1
C0496 Glass scale 1 1
SG110 Cylindrical base 1 1

Light & Optics Experiments