A slit of width is illuminated by monochromatic light of wavelength

PHYSICS · Subjective · A Level · Physics · Waves · Waves

Problem

A slit of width

0.050\,\text{mm}

is illuminated by monochromatic light of wavelength

500\,\text{nm}

. (a) Using the appropriate condition, calculate how many diffraction minima lie on one side of the central maximum within the angular range

0^{\circ}

20^{\circ}

. (b) Hence state the total number of minima that will be observed within the full angular range

-20^{\circ}

+20^{\circ}