Question: When a green laser light ((lambda=550 mathrm{~nm})) shines on a fracture-line crack in a thin piece of metal, a diffraction pattern is observed on a

When a green laser light $(\lambda=550 \mathrm{~nm})$ shines on a fracture-line crack in a thin piece of metal, a diffraction pattern is observed on a screen located $L=0.80 \mathrm{~m}$ from the metal. If the width of the central bright fringe is $w=10 \mathrm{~mm}$, what is the width of the crack in the metal?

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