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# Light

### KS3 Q&A Reflection and Refraction

Define refraction? The name given to the ability of light to change its speed and direction when travelling into a more or less dense substance.
what is the scientific term used to describe an object which gives off its own light? Luminous
What is the name of the ray which travels towards a surface from a light source? Incident ray
What is the name of the angle that the reflected ray makes with the normal? Angle of reflection
What happens to the light when it enters a less dense medium (e.g. air)? The ray of light moves away from the normal
What happens if the incident ray hits a surface at 0 degrees? No refraction occurs
In Refraction what is the relationship between i and r? i does not equal r
in reflection what is the relationship between i and r? i = r
What do we mean by the term normal? this refers to a line drawn at right angles to the mirror where an incident ray hits the mirror or medium
Created by: PMcleod

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