The light rays will refract towards the normal of the medium and emerge out at the same angle.
when light rays enter a new medium in a new angle it may speed up or speed down
If light rays entered from one medium to another at 90 Degrees of the surface between the mediums, then the light rays would not be retracted. The light will straight through from the first medium to the second.
Refraction
Refraction
Refraction is the bending of light waves as they pass from one medium to another.
when light rays enter a new medium in a new angle it may speed up or speed down
Light rays bend when they enter a new medium at an angle because they either slow down or speed up. They speed up the most if they are in a vacuum.
An opaque medium.
If light rays entered from one medium to another at 90 Degrees of the surface between the mediums, then the light rays would not be retracted. The light will straight through from the first medium to the second.
Refraction
Refraction
When light travels through a transparent medium it is slowed down according to the refractive index of the medium. Also if light is incident at an angle onto a surface of such a material, the light rays are bent or refracted by an angle at the boundary of the material, the angle again depending on the refractive index.
Refraction is the bending of light waves as they pass from one medium to another.
The change in speed causes the light to bend. If it is travelling from an optically dencer to an optically rarer medium the ray will bend away from the normal. But if it is travelling from an optically rarer to an optically denser medium then it will bend towards the normal.
Reflected rays are equal to the angle of incoming rays.
Reflected rays are equal to the angle of incoming rays.
As it is parallel to the normal to the surface, the angle of incidence is zero and hence the angle of refraction also has to be zero. Hence no deviation and no refraction.