Hall Effect, Plancks constant using photo tube Photo electric effect, Helmholtz Resonator, Newtons rings Apparatus, Laser light diffraction by graduation marks, Laser light diffraction through adjustable slit, Wavelength of Sodium doublet, Absorption coefficient of liquids and transparent solids using Laser, Zener diode and LED I- V Characteristics, LCR Series and Parallel Resonance, GM Counter, Numerical Aperture and Acceptance angle