The Wave Nature of light: Interference Chapter 30 圆孔衍射 Circular disk G 单缝衍射 Single slit
The Wave Nature of Light; Interference Chapter 30 圆孔衍射 Circular disk 单缝衍射 Single slit H P * S G * S
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 wavefront
The 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
The Wave Nature of light: Interference Chapter 30 Planer wave Spherical wave 时刻的 t +△t 波阵面 时〈时刻的 刻 波阵面 的 波〈+2△ 阵区X时刻的 面〈波阵面 时刻的波阵面 +2△t 时刻的波阵面
The Wave Nature of Light; Interference Chapter 30 Spherical wave ut t +t 时刻的 波阵面 t 时 刻 的 波 阵 t + 2t 面 时刻的波阵面 Planer wave t 时 刻 的 波 阵 面 t +t 时刻的 波阵面 t + 2t 时刻的 波阵面 ut
The Wave Nature of light: Interference Chapter 30 30-2 Huygens Principle and the Law of refraction (p682) ○ The law of reflection: The angle of incidence(e,) The angle of reflection(01, 01 ○ The law of refraction sin e =12 SIn 2
The Wave Nature of Light; Interference Chapter 30 30-2 Huygens’ Principle and the Law of Refraction(p682) The law of refraction The law of reflection: The angle of incidence (1) = The angle of reflection (1 ’ ) 2 1 1 2 2 1 2 1 sin sin n n n v v = = = 1 1 ’ 2 n2 n1
The Wave Nature of Light: Interference Chapter 30 E B △太 △t
The Wave Nature of Light; Interference Chapter 30 r = ut r = ut 3 2 r = ut 3 A B 1 C D E F