A manufacturer wants to apply a single-layer antireflection coating made of ( ) to a…

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

Problem

A manufacturer wants to apply a single-layer antireflection coating made of

\mathrm{MgF}_2

(

n = 1.38

) to a glass lens (

n = 1.52

). What is the minimum non-zero thickness of the coating that will minimize reflection of normally incident green light of wavelength

550\,\text{nm}

in air? (a)

2.0 \times 10^{2}\,\text{nm}

(b)

1.4 \times 10^{2}\,\text{nm}

(c)

1.0 \times 10^{2}\,\text{nm}

(d)

2.8 \times 10^{2}\,\text{nm}