Internal reflection is a phenomenon in which light rays traveling through a denser medium, such as glass or water, encounter a less dense medium at an angle greater than the critical angle. This results in the light being reflected back into the denser medium instead of passing through it.
The correct way to draw internal reflection can be determined by using Snell's law, which states that the angle of incidence is equal to the angle of reflection. This means that the angle at which the light rays strike the interface between the two mediums must be equal to the angle at which they are reflected.
The angle of internal reflection is affected by the refractive indices of the two mediums, the angle at which the light rays enter the interface, and the wavelength of the light. Additionally, the surface of the interface and any impurities or imperfections in the medium can also affect the angle of internal reflection.
Internal reflection is used in a variety of practical applications, such as in optical fibers for telecommunication, in cameras and binoculars to redirect light, and in mirrors for reflecting light. It is also used in various scientific instruments, such as microscopes and telescopes, to manipulate and redirect light.
No, internal reflection is not always 100% efficient. Some of the light rays may be absorbed or scattered as they pass through the interface, resulting in a loss of intensity. Additionally, if the angle of incidence is not greater than the critical angle, the light will not undergo internal reflection and will instead pass through the interface.