Question

A soap bubble (n=1.35) is floating in air . If the thickness of the bubble wall is 115 nm, dertemine the wavelength of the visible light that is most strongly reflected?


NOTE: NEEDED AS FAST AS POSSIBLE

Answer 1

The condition is

$$2nt=(m+1/2)\lambda.$$

Express the wavelength:

$$\lambda=\frac{2nt}{m+1/2},\\\space\\ \lambda=\frac{2\cdot1.35\cdot115}{0+1/2}=621\text{ nm}.$$