Single and Double Slit Diffraction PDF

## Table 7.1 Differences Between Single Slit and Double-Slits Diffraction | Single-Slit Diffraction |Double-Slits Diffraction | |---|---| | Consist of one slit | Consist of two slits | | Waves that originate within the same slit interfere | Slits are so small that each one is considered as a single...

## Table 7.1 Differences Between Single Slit and Double-Slits Diffraction | Single-Slit Diffraction |Double-Slits Diffraction | |---|---| | Consist of one slit | Consist of two slits | | Waves that originate within the same slit interfere | Slits are so small that each one is considered as a single light source, and the interference of waves originating within the same slit can be neglected | | The fringes are broad and not as sharp | The fringes are narrow and sharp | | All bright fringes are visible | Some bright fringes are missing since they suppressed by the minima of a single-slit interference pattern | | Intensity: $I = I_0 [sin (π a sin(\frac{\theta}{\lambda})/(π a sin(\frac{\theta}{\lambda}))]^2$ | Intensity: $I = I_0 cos^2[π d sin(\frac{\theta}{\lambda})][sin(π a sin(\frac{\theta}{\lambda}))(π a sin(\frac{\theta}{\lambda})]^2$ | ## Figure 7.11 Comparison of Diffraction Intensities of Light for Single Slit and Double Slits The image shows a graph with light intensity on the y-axis. Three curves are plotted: - Bottom curve: Double-slit interference pattern. It shows a series of equally-spaced, narrow peaks. - Middle curve: Combined fringe pattern. It shows a superposition of the single-slit and the double-slit interference pattern. The peaks are wider than the double-slit pattern, but narrower and sharper than the single-slit pattern. - Top curve: The single-slit interference pattern. This curve is wider and with smaller peak amplitudes compared to the double-slit interference pattern.