REFLECTIONSALIGAO, MARIA FRANCHESCA E.

OD3A

•occurs when the waves encounter a surface or other boundary that does not absorb the energy of the radiation and bounces the waves away from the surface

•The return of light, heat, sound, etc. after striking a surface.

•Bouncing back of light.

TYPES OF REFLECTION

• Specular/Regular Reflection

• Light reflected from a smooth surface at a definite angle.

• Diffuse Reflection

• Produced by rough surfaces that tend to reflect light in all directions.

MIRRORS

•A reflecting surface that forms an image of an object when light rays coming from that object fall upon it.

•a reflective surface, now typically of glass coated with a metal amalgam, that reflects a clear image.

TYPES OF MIRRORS•PLANE MIRROR 

• mirror with a flat (planar) reflective surface. 

• A plane mirror makes an image of objects in front of it; these images appear to be behind the plane in which the mirror lies. A straight line drawn from part of an object to the corresponding part of its image makes a right angle with, and is bisected by, the surface of the plane mirror.

• The image formed by a plane mirror is always virtual (meaning that the light rays do not actually come from the image), upright, and of the same shape and size as the object it is reflecting. 

CURVED MIRRORS

•spherical mirror

•a mirror with a curved reflecting surface

•2 types:

concave

convex

INTERFACE

• Interface is a surface separating 2 phases of matter, each of which may be solid, liquid or gas.

• It is not a geometric surface, rather a thin layer with differing properties on either side of it.

“NORMAL” TO THE

SURFACE

•Normal to the surface or normal vector is a vector which is perpendicular to the surface at a give point

INCIDENT AND REFLECTED RAY

• A ray of light that is pointing towards and striking at the surface.

INCIDENT RAY

•The ray thrown back from the surface after being hit by the incident ray.

REFLECTED RAY

ANGLE OF INCIDENC AND

ANGLE OF REFLECTION

•Angle of incidence - the angle between the incident ray and the normal of the surface.

•Angle of Reflection -the angle measured from the reflected ray and the normal of the surface.

•The angle of incidence is equal to the angle of reflection

GLANCING ANGLE AND POINT OF

INCIDENCE

GLANCING ANGLE

• Also called "Grazing angle"

• Angle between incident ray and the surface upon which it is incident.

• Complement of angle of incidence.

POINT OF INCIDENCE

•the point where the ray of incidence strikes the mirror.

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