I DONT AGREE WITH ABOVE POST

laboratory teCHnique YOU CAN DO:

SPEED OF LIGHT IS MEASURED BY ALLOWING A BEAM OF LIGHT TO FALL OVER A DISTANCE FOR WHICH

LIGHT WOULD TAKE CONSIDERABLE TIME TO COVER(USUALLY IN VCCUM TO PREVENT ATTENUATION OR REFRACTION)

THEN SPEED OF LIGHT =DISTANCE TRAVERSED/TIME TAKEN

PROFESSIONAL WAY:USE COMPUTERISED SETUP USING LIGHT DETECTING DIODES THAT IS PHOTO DIODE AND MEASURE THE TIME LAPSE BY MACHINES