SOME ASSOCIATED TERMS -Class 10 -Science- Refraction- Physics-Chapter 10 – Light – Reflection and Refraction

Class 10 -Science-SOME ASSOCIATED TERMS – Refraction- Physics-Chapter 10 – Light – Reflection and Refraction

◆ Transparent surface : The plane surface which refracts light, is called transparent surface. In diagram, XY is the section of a plane transparent surface. 

◆ Point of incidence : The point on transparent surface, where the ray of light meets it, is called point of incidence. In diagram, Q is the point of incidence. 

◆ Normal : Perpendicular drawn on the transparent surface at the point of incidence, is called normal. In diagram, N1QN2 is the normal on surface XY. 

◆ Incident ray : The ray of light which strikes the transparent surface at the point of incidence, is called incident ray in diagram PQ is the incident ray. 

◆ Refracted ray : The ray of light which travels from the point of incidence into the other medium, is called refracted ray. In diagram, QR is the refracted ray. 

◆ Angle of incidence : The angle between the incident ray and the normal on the transparent surface at the point of incidence, is called the angle of incidence. It is represented by the symbol i. In diagram, angle PQN1 is the angle of incidence. 

◆ Angle of refraction : The angle between the refracted ray and the normal on the transparent surface at the point of incidence, is called angle of refraction. It is represented by symbol r. In diagram angle RQN2 is the angle of refraction. 

◆  Plane of incidence : The plane containing the normal and the incident ray, is called plane of incidence. For the diagram, plane of book page is the plane of incidence.