A parallel beam of monochromatic light of wavelength is incident on a single narrow slit of width . The light is focused by a convex lens on a screen placed on a focal plane. The first minimum will be formed for the angle of diffraction equal to
Step 1: Given data
Wavelength of light,
Step 2: To find
The angle of diffraction in which the first minimum will be formed.
Step 3: Formula used
where is the slit width, is the wavelength of light and is the nth minima.
Step 4: Calculation for the angle:
Here since the first minimum is considered,
Substituting the values,
The first minimum will be formed for the angle of diffraction equal to
Option D is correct