In a Young’s double-slit experiment

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

Problem

In a Young’s double-slit experiment, the distance between the interference fringes on the screen is

2.8\,\text{mm}

when the screen is

1.4\,\text{m}

away from two slits that are

0.20\,\text{mm}

apart. Find the wavelength of the monochromatic light used. (a)

280\,\text{nm}

(b)

560\,\text{nm}

(c)

400\,\text{nm}

(d)

200\,\text{nm}