Question: What is the angle of diffraction for the first minimum in a single-slit diffraction pattern if the slit width is 0.5 mm and the wavelength of light is 500 nm? (2023)

Options:

1. 30°
2. 60°
3. 45°
4. 15°

Correct Answer: 45°

Exam Year: 2023

Solution:

The angle for the first minimum is given by sin θ = λ/a, where a is the slit width. Thus, sin θ = 500 nm / 0.5 mm = 0.001, leading to θ ≈ 30°.