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Refraction, reflection and Rectilinear Propagation
Posted Date: 11 Dec 2007 Resource Type: Articles/Knowledge Sharing Category: Education
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Posted By: Mala Member Level: Diamond
Rating:  Points: 3
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Although the above three terms sounds alike., they are different in the following ways.
Refraction :- is the bending of light as it passes between materials of different optical density.
Refraction is the change in direction of a wave due to a change in its speed. This is most commonly seen when a wave passes from one medium to another. Refraction of light is the most commonly seen example, but any type of wave can refract when it interacts with a medium, for example when sound waves pass from one medium into another or when water waves move into water of a different depth. Refraction is described by Snell's law.
Reflection :- Throwing back or deflection of waves, such as light or sound waves, when they hit a surface. Reflection occurs whenever light falls on an object. The law of reflection states that the angle of incidence (the angle between the ray and a perpendicular line drawn to the surface) is equal to the angle of reflection (the angle between the reflected ray and a perpendicular to the surface).
Rectilinear propagation:- is a wave property which states that waves propogate (move or spread out) in straight lines. This property applies to both transverse and longitudinal waves. Even though a wave front may be bent (the waves created by a rock hitting a pond) the individual waves are moving in straight lines.
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