Typical types of interference(1) Two points on thesame wave frontS*(double-slit)(2) Light reflected bytwo surfaces(thin films)
Typical types of interference P S * ·P S * (1) Two points on the same wave front (2) Light reflected by two surfaces (double-slit) (thin films)
Interference of lightCoherent lights from same source in vacuum:A= A + A,?+2A,A,cos△pAmplitude:2元where p= k(r2 -r)A1Ar: Path difference元Intensity:I = I, + I, +2 /l,,cos△p1)△=2m=△r =m= Ibrightmaxdark2) △β =(2m+1)元 = △r =(m +=)=)min1
Interference of light Amplitude: = + + 2 1 2 cos 2 2 2 A A1 A A A 2 1 2 k r r r ( ) where = − = 1 2 1 2 Intensity: I I I I I = + + 2 cos Coherent lights from same source in vacuum: max 1) 2 = = m r m I bright min 1 2) (2 1) ( ) 2 = + = + m r m I dark Δr: Path difference
Young's double-slit experimentClassical experiment in the historyConvincing evidence for wave nature of lightCEquipmentxSTo& Results6dsinoS2LPlane monochromatic light falls on the two slits
Young’s double-slit experiment Classical experiment in the history Convincing evidence for wave nature of light Equipment & Results Plane monochromatic light falls on the two slits
Graphs & intensity1级亮条纹+1级暗条纹0级亮条纹1级珞条奴亮条蚊BrightIntensityDarkDiffraction
Graphs & intensity Bright Dark Intensity Diffraction