<html><head></head><body><div style="color:#000; background-color:#fff; font-family:Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:13px"><div id="yui_3_16_0_ym19_1_1506460071032_3927">Andrew</div><div id="yui_3_16_0_ym19_1_1506460071032_3928">multi- energetic light in the spectrographic effect in the diffraction and interference experiments suggests light (photon or wave) of different energy does not interfere.</div><div id="yui_3_16_0_ym19_1_1506460071032_3929">Single photon experiments (only one energy present at a time) of diffraction and interference require the photon to self interfere. The accumulation of single photons of different energies recover the spectrographic effects.</div><div id="yui_3_16_0_ym19_1_1506460071032_3930">I think interference of photons is also suggested in the quantum eraser experiments.</div><div dir="ltr" id="yui_3_16_0_ym19_1_1506460071032_3931">Hodge</div></div></body></html>