Colours of thin soap bubbles are due to Colours of thin soap bubbles are due to August 13, 2020 Category: Chapter 32 - Ray Optics , NEET Last 32 Years Solved 1988 - 2019 Physics and Chemistry Video Solutions , Physics , Facebook Messenger WhatsApp Share this:TwitterFacebook Related Assertion : Thin films such a soap bubble or a thin layer of oil on water show beautiful colours when illuminated by white light. Reason : Light reflected from the upper surface of the thin film due to the interference.Two spherical soap bubbles of radii a and b in vacuum coaleasee under isothermal conditions. The resulting bubbles has a radius given by:Two soap bubbles have radii in the ratio 1 : 2 . compare the excess of pressure inside these bubbles. Also compare the work done in blowing these bubbles