9702 · 8.2
Diffraction
Imagine sound bending around a corner or light spreading after passing through a tiny gap. This fascinating wave phenomenon is called **diffraction**. It's how waves, from light to sound, spread out when they encounter an obstacle or an opening, revealing their wave nature. Understanding diffraction is key to explaining everything from crystal structures to the vivid colours in a CD. This pilot aligns with **Senpai Corner** AS notes (2025-2027) for topic **8.2**.
Need to know
What you need to know
- $d$: The slit spacing (distance between adjacent slits). Often calculated from the number of lines per unit length (e.g., $d = 1 / N$, where $N$ is lines per metre).
- $\theta$: The angle of the $n$-th order maximum relative to the central ($n=0$) maximum.
- $\lambda$: The wavelength of the incident light.
- $n$: The order of the maximum (an integer: \$0, 1, 2, ...$).
Explanation
Diffraction
- $d$: The slit spacing (distance between adjacent slits). Often calculated from the number of lines per unit length (e.g., $d = 1 / N$, where $N$ is lines per metre).
- $\theta$: The angle of the $n$-th order maximum relative to the central ($n=0$) maximum.
- $\lambda$: The wavelength of the incident light.
- $n$: The order of the maximum (an integer: \$0, 1, 2, ...$).