洲第十二章光的衍射( Diffraction) 光的衍射现象:光波在空间传播遇到障碍时,其传 播方向会偏离直线传播,弯入到障 碍物的几何阴影中,并呈现光强的 不均匀分布的现象。 天津大学精仪学院 天津大学作 24
1 第十二章 光的衍射（Diffraction） 光的衍射现象：光波在空间传播遇到障碍时，其传 播方向会偏离直线传播，弯入到障 碍物的几何阴影中，并呈现光强的 不均匀分布的现象
What is the diffraction When light passes through a narrow slit it spreads out more than what could be 天津大学精仪学院 accounted for by geometric construction This is an example of diffraction Diffraction can be defined as any departure from the predictions of geometric optics 天津大学作 24
2 When light passes through a narrow slit, it spreads out more than what could be accounted for by geometric construction. This is an example of diffraction. Diffraction can be defined as any departure from the predictions of geometric optics. What is the Diffraction?
Diffraction e The phenomenon that the light waves tend to bend around and become spread out when they pass near a barrier is called 天津大学精仪学院 diffraction Diffraction of light occurs when a light wave passes by a corner or through an opening or slit that is physically the approximate size of, or even smaller than that light's wavelengtH 天津大学作 24
3 • The phenomenon that the light waves tend to bend around and become spread out when they pass near a barrier is called diffraction. • Diffraction of light occurs when a light wave passes by a corner or through an opening or slit that is physically the approximate size of, or even smaller than that light's wavelength. Diffraction
过 Related Concept The terms difraction and scattering are often used interchangeably and are considered to be almost synonymous 天津大学精仪学院 Diffraction describes a specialized case of light scattering in which an object with regularly repeating features(such as a diffraction grating produces an orderly diffraction of 天害大学顺华 ight in a diffraction pattern 24
4 Related Concept • The terms diffraction and scattering are often used interchangeably and are considered to be almost synonymous. • Diffraction describes a specialized case of light scattering in which an object with regularly repeating features (such as a diffraction grating) produces an orderly diffraction of light in a diffraction pattern
In the real world most objects are very complex in shape and should be considered to be 天津大学精仪学院 composed of many individual diffraction features that can collectively produce a random scattering of light 天速大学作 24
5 • In the real world most objects are very complex in shape and should be considered to be composed of many individual diffraction features that can collectively produce a random scattering of light