The Wave Nature of light: Interference Chapter 30 2. Huygens Principle惠更斯原理(p680-681) All points on a wavefront serve as point sources of spherical secondary wavelets(子波). After a time t, the new position of the wavefront will be that of a surface tangent to these secondary waⅴ lets 惠更斯原理一波在媒质中传播到的各点,都可看 成新的子波源。波振面上所有点都可视为发射子波的波 源,其后任一时刻,这些子波的包迹就是新的波振面 人人人 New wavefrontThe Wave Nature of Light; Interference Chapter 30 2. Huygens’ Principle 惠更斯原理 (p680-681) 惠更斯原理----波在媒质中传播到的各点，都可看 成新的子波源。波振面上所有点都可视为发射子波的波 源，其后任一时刻，这些子波的包迹就是新的波振面. All points on a wavefront serve as point sources of spherical secondary wavelets（子波）. After a time t, the new position of the wavefront will be that of a surface tangent to these secondary wavelets. New wavefront