A transparent film of uniform thickness is deposited on a glass substrate

PHYSICS · Single correct · AP · Physics 2: Algebra-based · Waves Sound and Physical Optics · Waves Sound and Physical Optics

Problem

A transparent film of uniform thickness

350\,\text{nm}

is deposited on a glass substrate. When white light is incident normally from air, strong reflected maxima are observed at

700\,\text{nm}

and

410\,\text{nm}

. Assuming these two wavelengths correspond to successive interference orders, what is the approximate refractive index of the film? (a)

1.63

(b)

1.20

(c)

1.41

(d)

2.00