Why do soap bubbles appear colourful? | Wave optics | Physics | Khan Academy
Channel: Khan Academy India - English
Date: 2022-10-11

What do a soap bubble and a blue morpho butterfly have in common? Their wonderful vibrant colours? That's correct! Let's understand how thin film interference leads to such vibrant colours. 

00:00 Introduction
00:48 Breaking down the phrase - Thin film interference
01:50 Zooming into the soap bubble
03:21 Path difference between two light waves 
04:03 Constructive and Destructive interference
05:38 Varying thickness of the film changes the colours we see
06:00 Why is the blue morpho butterfly blue?
06:54 Why don't we see colours in a liquid drop or a window pane

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