Question

A friend who has studied grade 11 physics challenges you to provide everyday evidence that light can form interference patterns. Reflect on your learning and everyday experiences, and provide an example for your friend.Please provide an everyday example that light can form interference patterns, and explain how it does so.

Answer 1

An example of light forming interference patterns is a soap bubble with different colors (like a rainbow)

This is due to the interference of light rays that are reflected from inner and outer surfaces of the soap bubble layer which is thick.

The light ray reflected from the inner part of the soap layer has to traverse a larger path length and that depends on the wavelengths of component colors of the light ray.