A soap bubble has an index of refraction of 1.33. What minimum thickness of this bubble will ensure maximum reflectance of normally incident 530 nm wavelength light?
A)24.9 nm
B)56.7 nm
C)99.6 nm
D)199 nm
E)398 nm

Question

Quizplus · Accepted Answer

For maximum reflectance, the thickness should be a quarter of the wavelength in the medium. The wavelength in the medium is 530 nm / 1.33. The minimum thickness is (1/4) * (530 nm / 1.33) ≈ 99.6 nm.

A Soap Bubble Has an Index of Refraction of 1