need help ..plzz answer this will mark as brainliest ! anwer the following question
“for a ray of light passing through a glass slab at different angles. if the angle of incidence increases, the angle of deviation decreases,but after a certain value of the angle of incidence, the angle of deviation increases.what is the specific value of the angle of incidence called?is this value same for light of all colour?
Answers
This certain value is known as Angle of minimum deviation.. At this point the angle of incidence becomes equal to the angle of emergence..
It depends on what object the light is incident on. In case of a glass slab, the incident ray is parallel to the emergent ray, that means the angle of incidence is equal to the angle of emergence. The explanation is as follows: When a ray of light is incident on the surface of the glass slab, it undergoes refraction. As the refractive index of the glass slab is denser than that of air, the ray of light bends towards the normal. The same ray of light which is refracted acts as the ray of incidence on the inner surface of the glass slab. it undergoes refraction again and the the ration of the refractive indices between air and glass is same, the emergent ray is parallel to the incident ray. Hence the angles are equal.
In Case of a prism:A ray of light suffers two refraction on passing through a prism. ... The angle through which the emergent ray deviates from the direction of incident ray is called angle of deviation 'd'. As the angle of incidence is increased, angle of deviation 'd' decreases and reaches minimum value.