Monochromatic light of wavelength is used in a double-slit arrangement

PHYSICS · Subjective · A Level · Physics · Waves · Waves

Problem

Monochromatic light of wavelength

600\,\text{nm}

is used in a double-slit arrangement. At a certain point on the screen the path difference between the two interfering waves is

1.20\,\text{μm}

. Determine whether the intensity at this point is maximum or minimum.