Optical illusions are caused by a mismatch of what the eyes see and what the brain interprets, according to ABC News. The brain is often tricked into thinking something is moving when contrasting colors are placed in close proximity to each other and repeated. This is why when people want a pattern to move like an optical illusion, the shapes of the pattern are outlined in black and white.Know More
Optical illusions, however, are not always caused by repeating patterns. One example of this is when people see stars when they hit their heat really hard. People know they are not actually seeing stars, but the hard blow to the head causes neurons in the eyes to become visible for a short period of time. These neurons are misinterpreted by the brain as being light, so they closely resemble stars that people see in the night sky.
The term optical illusion is not the best way to describe this phenomenon, according to ABC News. It is best to call them visual illusions, because the illusion is caused by more than just the eyes. It is caused by the primary visual cortex, which is the area of the brain that helps to process visual information.Learn more about Optics & Waves
The optical density of a substance is the logarithmic ratio of the intensity of transmitted light to the intensity of the incident light passing through the substance. It is otherwise measured as the absorbed radiation of the corresponding wavelength. Optical density refers to the absorbance of a substance.Full Answer >
According to HowStuffWorks, optical cables work by lining the inside of a wire with thin strands of glass and coating those strands of glass with two layers of plastic. The plastic creates a mirror-like effect around the glass that allows for internal reflection to help light travel through the optic strands.Full Answer >
Optical devices include magnifying lenses, spectacles, binoculars, microscopes, telescopes and lasers. Optical devices manipulate light waves to aid in viewing or analyzing those waves to determine properties of the object in view.Full Answer >
Optical lenses use the principle of refraction to focus light rays or disperse them. Refraction is the bending of a ray of light when it moves between media of different densities at an angle.Full Answer >