Light of unknown wavelength passes through a slit of width and produces a diffraction…

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

Problem

Light of unknown wavelength passes through a slit of width

0.15\,\text{mm}

and produces a diffraction pattern on a screen

2.0\,\text{m}

away. The distances

y

from the central maximum to the first four dark fringes are listed. Order

m

| Distance

y

(mm) 1 | 7.2 2 | 14.8 3 | 22.1 4 | 29.4 Using all of the data, which of the following is the best estimate of the wavelength of the light? (a)

540\ \text{nm}

(b)

550\ \text{nm}

(c)

270\ \text{nm}

(d)

2.2\ \mu\text{m}