A parallel beam of monochromatic light of wavelength 450 m passes through a long slit of width 0.2 mm. find the angular divergence in which most of the light is diffracted.

Explanation

To solve the problem of finding the angular divergence in which most of the light is diffracted when a parallel beam of monochromatic light passes through a slit, we can use the principles of single-slit diffraction.

### Step-by-Step Solution:

1. **Identify the Given Values:**
- Wavelength of light, \( \lambda = 450 \) nm = \( 450 \times 10^{-9} \) m
- Width of the slit, \( a = 0.2 \) mm = \( 0.2 \times 10^{-3} \) m

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