1 These thio relaxers have a gentler action than other relaxer chemicals, so are a popular option when you want effective straightening with a lower risk of damage to the hair. 2  Japanese straightening systems use thio based relaxers.ons. 1  As the name suggests, this technique relaxes hair rather then leaving it poker straight, so if you want absolute stick straight and frizz-free hair, this method may not be for you. 2  As with every chemical process, the ever present risk of damage is there.
Types of Optical Illusions. There are currently three types of optical illusions: literal illusions, cognitive illusions, and physiological illusions. Each of these illusions trick our brain into misunderstanding what we see in various ways. A cognitive illusion happens when the brain perceives an object based on prior knowledge or assumptions.
See also list of optical topics and optics. A mirage is an example of an optical phenomenon. Common optical phenomena are often due to the interaction of light from the sun or moon with the atmosphere, clouds, water, dust, and other particulates.One common example is the rainbow, when light from the sun is reflected and refracted by water droplets.ptical phenomena include those arising from the optical properties of the atmosphere; the rest of nature (other phenomena); of objects, whether natural or human-made (optical effects); and of our eyes (Entoptic phenomena).