flat mirror called a pane mirror, is a good reflector of light. when a ray of light strikes the mirror at a right angle ,it is reflected along the same path. Scientists call this line normal. When a ray of light hits a plane mirror at an angle to the normal(called the angle of incidence),it is reflected at an equal angle but on the opposite side of the normal(the angle of reflection) .These two angles always are always equal no matter how light rays strikes the mirror. This generalization is called the law of reflection .
In a plane mirror, - the image is upright and of the same size as the object
-the image lies as far behind the mirror as the object is in front of the mirror.
-an image is laterally inverted.
-the image formed is always a virtual image.
Type of reflection -regular reflection and diffuse reflection
Regular reflection:
-when a parallel beam of light hits a smooth surface such as a plane mirror, it is reflected as a parallel beam.
-an image is formed.
Diffuse reflection:
-when a beam of light hits a rough surface, the individual rays are reflected in different directions.
-no image is formed.
The use of plane mirror: -people use plane mirrors to check their appearance.
-plane mirrors on walls make the room bigger.
-the rear view mirror of a car helps the diver to see traffic behind the car.
-two plane mirrors are used in a periscope to reflect and change the direction of light.
-a telescope uses mirrors to produce very clear image.
Laws in this topic
–light travels in straight lines.
-for reflection in a plane mirror, the angle of incidence is equal to the angle of reflection.
-the angle of incidence=the angle of reflection.
Resources are from: textbook and www.treemo.com/users/somniumfate/channel/item/62506
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