折射(refraction) n=1 n>1 n=1 折射率(refractive index ●Vacuum 1 .Air 1.0003 ●Water 1.333 Incident wave Reflected .Cytoplasm 1.35-1.38? wave ● 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 → Snell's law: Mirror law: Sin(0)=n2 Sin(02) 9折射(refraction) • 折射率(refractive index 9