A narrow slit of width is submerged in water (index of refraction ) and illuminated…

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

Problem

A narrow slit of width

0.10\,\text{mm}

is submerged in water (index of refraction

n=1.33

) and illuminated with monochromatic light from an unknown source. A screen

1.5\,\text{m}

away shows the first dark fringe at a distance of

4.0\,\text{mm}

from the center of the pattern. What is the wavelength of the light in air? (a)

472\ \text{nm}

(b)

354\ \text{nm}

(c)

267\ \text{nm}

(d)

532\ \text{nm}