Find the minimum thickness (in nm) of a soap bubble that appears red when illuminated by white light perpendicular to its surface. Take the wavelength to be 680 nm, and assume the same index of refraction as water.

The thickness of the soap bubble is 170 nm.

Explanation:

Given that,

Wavelength of light,

We need to find the minimum thickness of a soap bubble that appears red when illuminated by white light perpendicular to its surface. Let t is the minimum thickness of the film. When reflection is taking place at an interface, then the condition for constructive interference is given by :

So, the thickness of the soap bubble is 170 nm.

im srry but ur wrong the answer is d a smooth rock, some red dirt, and an empty bird's nest.