Visible light of wavelength passes through a slit wide and forms a pattern on a…

PHYSICS · Single correct · A Level · Physics · Waves · Waves

Problem

Visible light of wavelength

500\,\text{nm}

passes through a slit

0.10\,\text{mm}

wide and forms a pattern on a screen

2.0\,\text{m}

away. How many dark fringes are located within

\pm 3.0\,\text{cm}

of the central axis on the screen? (a) 8 (b) 6 (c) 5 (d) 7