Abstract: In this study, a double slit experiment was carried out to verify whether there is a light interference, however after carrying out the testing, no light interference on the screen was found. It was due to numerous beams of light from the so-called coherent light source giving a diffraction grating effect pattern on the screen. Unfortunately, the listed reference materials do not match the current finding of “no light interference in a double-slit experiment”. That is the reason why this experiment was carried out to prove that the current study findings are correct.