Sure, let's discuss the Fraunhofer diffraction patterns for a vertical single slit, a vertical double slit, and derive the expression for intensity distribution in the case of a double slit.

### Vertical Single Slit Diffraction:

#### Salient Features:
- Pattern Shape: The diffraction pattern consists of a central bright maximum (main lobe) surrounded by alternating bright and dark fringes (side lobes).
- Width of Central Maximum: The central maximum is wider compared to the side lobes.
- Intensity: The intensity decreases as we move away from the central maximum, and the fringes become less bright farther from the center.

### Vertical Double Slit Diffraction:

#### Salient Features:
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