A screen is placed from a narrow slit

PHYSICS · Subjective · CBSE · Physics · Wave Optics · Wave Optics

Problem

A screen is placed

1.5\,\text{m}

from a narrow slit. On the screen the first dark band occurs

4.0\,\text{mm}

from the center of the central bright band when light of wavelength

550\,\text{nm}

is used. Determine the width of the slit.