Physics

Problem

A single slit

0.050\,\text{mm}

wide is illuminated by light of wavelength

650\,\text{nm}

. A screen

1.8\,\text{m}

away is large enough to show the pattern from

5.0\,\text{cm}

above the central axis to

4.0\,\text{cm}

below it. How many dark fringes are visible on the entire screen? a) 4 b) 3 c) 5 d) 2