当一束光射到折射率为n的材料表面时，比如垂直入射，光进入和离开折射介质

When a beam is incident on the refractive index n of the material surface, such as normal incidence, both entering and leaving a portion of the light is reflected when the refracting medium. So when we look at a reflection film on the light, to see the superimposing two wave. If the film thickness is sufficiently small, the two columns wave interference occurs, destructive interference, depending on the phase difference between two acoustic waves or interference or is relative. For example, enhanced red reflective for blue light (which has a different wavelength), perhaps reflecting obtain destructive interference, so we see a bright red reflection light. If you change the film thickness, that is, if watching another thick places, the situation may turn out red interfere, but did not interfere with the blue light out. So it was bright blue, but also showed the color of green, yellow or whatever utter the name. So when we watch the film will see color, but when we look at from different angles, the color will change.

When a beam of light hits the surface of a material with a refractive index of n, such as vertical incident, a portion of light enters and leaves the refractive medium is reflected. So when we look at the reflection of a light source on the film, we see the superposition of two columns of waves. If the film thickness is small enough, the two waves will interfere, either for phase length or for phase elimination, depending on the phase difference between the two waves. For example, for the enhanced reflection of red light, for blue light (which has different wavelengths), perhaps the reflection of phase interference, so we see bright red reflected light. If you change the thickness of the film, that is, if you look at another thicker place, the situation may be reversed, the red light will interfere, while the blue light does not interfere. It is therefore bright blue, but also green, yellow or anything else called a name color. So when we look at the film, we see color, and when we look at it from a different perspective, the color changes.

When a beam of light hits the surface of a material with a refractive index of N, such as vertical incidence, some of the light is reflected when it enters and leaves the refractive medium. So when we look at the reflection of a light source on the film, we see the superposition of two waves. If the thickness of the film is small enough, the interference between the two waves will occur, depending on the phase difference of the two waves. For example, for red light, we can get enhanced reflection, for blue light (which has different wavelengths), we can get the reflection of interference cancellation, so we can see the bright red reflection. If you change the thickness of the film, that is to say, if you look at another thicker place, the situation may turn around, and the red light will interfere, while the blue light will not. So it is bright blue, but also green, yellow or other nameless color. So when we look at the film, we see color, and when we look at it from different angles, the color changes.<br>