To investigate the Lambert’s direction law (cosine law).



Experimental procedure

  1. Swich on measuring amplifier.
  2. Mount the lux meter at a separation of L=400mm,from the light source,connect to the measuring amplifier.Remove all the fitting in between.
  3. Switch on measuring amplifier,note the offest displayed(ambient light).
  4. Mount the light source in postion φ=0 0 ,connect load connector and switch on.
  5. Turn the power regulator to full.
  6. take the series of measurements by increasing the angle of incidence φ in steps of  10 0 and reading the illuminance E.

Virtual Experimentation Procedure :

 

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INPUT PALETTE :

OUTPUT PALETTE :