How can crossed Polaroids analyse the stress concentration of plastics and different colors of light could be seen? I thought crossed polaroids won't allow any light to pass through. - Quora
![Two polaroids are crossed. If now one of them is rotated through 30^0 and unpolarised light of intensity I0 is incident on the first polaroid,then the intensity of transmitted light will be Two polaroids are crossed. If now one of them is rotated through 30^0 and unpolarised light of intensity I0 is incident on the first polaroid,then the intensity of transmitted light will be](https://dwes9vv9u0550.cloudfront.net/images/4457750/de9615a5-5656-4e12-8528-da6287a8c129.jpg)
Two polaroids are crossed. If now one of them is rotated through 30^0 and unpolarised light of intensity I0 is incident on the first polaroid,then the intensity of transmitted light will be
![Two polaroids are placed with their transmission axis at 90° to each other and transmitted intensity of light is zero. What happens in the intensity if one more polaroid is placed in Two polaroids are placed with their transmission axis at 90° to each other and transmitted intensity of light is zero. What happens in the intensity if one more polaroid is placed in](https://qph.cf2.quoracdn.net/main-qimg-5b002b06861d79d346f060175834d209.webp)