Monochromatic light of a wavelength 650 nm falls normally on a slit of width `1:3 xx 10^(-4)` cm and the resulting Fraunhofer diffraction is obtained on a screen. Find the angular width of the central maxima. 

Explanation

To find the angular width of the central maxima in a Fraunhofer diffraction pattern, we can follow these steps:

### Step 1: Identify the given values
- Wavelength of light, \( \lambda = 650 \, \text{nm} = 650 \times 10^{-9} \, \text{m} \)
- Width of the slit, \( D = 1.3 \times 10^{-4} \, \text{cm} = 1.3 \times 10^{-6} \, \text{m} \)

### Step 2: Use the formula for the angle of the first minimum
In a single slit diffraction pattern, the angle \( \theta \) for the first minimum is given by:
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