A slit of width is illuminated by light of wavelength

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

Problem

A slit of width

0.12\,\text{mm}

is illuminated by light of wavelength

600\,\text{nm}

. When the screen is

0.80\,\text{m}

from the slit, the third dark fringe is observed

12\,\text{mm}

from the centre. If the screen is moved to a distance of

1.60\,\text{m}

, at what distance from the centre will the third dark fringe appear?