Question

The wavelength of a monochromatic light which is used in single slit diffraction is \(800\,\text{nm}\). The width of the single slit for which the first minimum appears at \(\theta = 45^\circ\) on the screen will be:

• A. \(1.13\,\mu m\)
• B. \(1.23\,\mu m\)
• C. \(2.13\,\mu m\)
• D. \(1.3\,\mu m\)

Hint:

For first minimum in single slit diffraction, always use \(a \sin\theta = \lambda\). No factor of 2 or higher order term is used.

Answer 1

The Correct Option is A