Laser light of wavelength illuminates a slit of width

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

Problem

Laser light of wavelength

550\,\text{nm}

illuminates a slit of width

20\,\mu\text{m}

. A screen is placed

1.5\,\text{m}

from the slit. The screen extends only to the right of the central axis and its edge is

4.0\,\text{cm}

from that axis. How many diffraction minima are observable on the screen? (a)

1

(b)

2

(c)

0

(d)

3