Hi all. I am doing a project in which I have a 99%clear transparent Silicone sheet. LEDs make light pass through this material which is than picked up by phototransistors on the other side. when someone/something touches the Silicone, this deforms and the phototransistors pick up different light signals. I need to understand how light behaves when a touch on the Silicone is made. Could someone help me please?