Young’s Double Slit Simulator
楊氏雙狹縫模擬器
Billy Sir’s Interactive Physics: Wave Interference & Diffraction.
物理化學 Billy Sir 互動物理：波的干涉與繞射
Interference Pattern
干涉圖樣
The Physics Behind the Pattern | 圖樣背後的物理原理
The total intensity \(I(\theta)\) on the screen is the product of two distinct phenomena: the interference between the two slits, and the diffraction caused by the finite width of each individual slit.
屏幕上的總強度 \(I(\theta)\) 是兩種不同現象的乘積：兩個狹縫之間的干涉，以及由每個狹縫有限寬度引起的繞射。
\[ I(\theta) = I_0 \cdot \underbrace{\cos^2\left(\frac{\pi d \sin\theta}{\lambda}\right)}_{\text{Interference}} \cdot \underbrace{\text{sinc}^2\left(\frac{\pi a \sin\theta}{\lambda}\right)}_{\text{Diffraction Envelope}} \]
- \(d\) is the slit separation distance. | 狹縫間距。
- \(a\) is the width of a single slit. | 單一狹縫寬度。
- \(\lambda\) is the wavelength of the light. | 光的波長。