Refraction(折射) n=1 n>1 n=1 Refractive index(折 射率) Vacuum 1 。Air 1.0003 Water 1.333 Incident wave Reflected ● Cytoplasm 1.35-1.38? wave 9 ●Glycerol 1.475 (anhydrous) Refractive index n,=1 ●Immersion oil 1.515 Speed =c ●Fused silica 1.46 Optical glasses 1.5-1.9 Refractive index na Speed c/n Refracted wave 。Diamond 2.417 2/n Depends on wavelength and temperature →Snel'slaw: Mirror law: n Sin(0)=n2 Sin(02) 8.=6 4Refraction (折射 ) • Refractive index ( 折 射率 ) 4