Question

The first diffraction minimum due to single slit diffraction is θ, for a light wavelength 5000 Å. If the width of slit is 1 × 10^-4 cm, then the value of θ is ______.

Options

• 30°

• 45°

• 60°

• 15°

Answer 1

The first diffraction minimum due to single slit diffraction is θ, for a light wavelength 5000 Å. If the width of slit is 1 × 10^-4 cm, then the value of θ is 30°.

Explanation:

d sin θ = nλ, n = 1

1 × 10^-6 × sinθ = 5000 × 10^-10 

sinθ = `1/2`

 θ = 30°