31. Dragonflies perceive horizontally polarized light as a sign of water. 32. This pressed amber yields brilliant interference colors in polarized light . 33. Land founded Polaroid in 1937, focusing on sunglasses and other technologies to polarize light . 34. Oval fat bodies exhibit a " Maltese cross " configuration under polarized light microscopy. 35. Simple techniques include illumination of the sample with polarized light . 36. Only a few mechanisms in nature are known to systematically produce circularly polarized light . 37. Polarizing sunglasses, for example, let through only vertically polarized light . 38. The phase information of the polarized light is not recorded in the stokes parameters. 39. The vector for partially polarized light lies within the sphere 40. The page Real D Cinema explains that they work by separating circularly polarized light .