Physics.

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Presentation transcript:

Physics

PHS 5041 Optics Plane Mirrors

PHS 5041 Optics Plane Mirrors Reflection of Light: Process that causes light to bounce off objects in its path

PHS 5041 Optics Plane Mirrors Diffuse reflection: Occurs when light strikes an irregular surface. Light rays get reflected in ALL directions. Does not produce an image on reflecting surface Specular (regular) reflection: Occurs when light strikes a smooth (polished) surface. Light rays get reflected in ONE direction. Produces an image on reflecting surface

PHS 5041 Optics Plane Mirrors

PHS 5041 Optics Plane Mirrors Laws of Reflection: The angle of the incident ray is equal to that of the reflected ray. The incident ray, the reflected ray and the normal (N) lie in the same plane

PHS 5041 Optics Plane Mirrors

PHS 5041 Optics Plane Mirrors Plane mirrors produce images that, with respect to the object, are: _Symmetrical with respect to the mirror _Same size and position of the object _Virtual images (because they cannot be formed on a screen) *Pinhole cameras produce real images

PHS 5041 Optics Plane Mirrors

PHS 5041 Optics Plane Mirrors Practice

PHS 5041 Optics Plane Mirrors Practice

PHS 5041 Optics Plane Mirrors Reflection (plane mirror) and Vision _light rays from the object get reflected by the mirror and reach our eyes _image appears behind the mirror

PHS 5041 Optics Plane Mirrors Virtual images _cannot be produced on a screen _are located at the intersection of the extensions of reflected rays

PHS 5041 Optics Plane Mirrors

PHS 5041 Optics Plane Mirrors Reversibility of Reflection

PHS 5041 Optics Plane Mirrors Reversibility of Reflection

PHS 5041 Optics Plane Mirrors Field of vision To be able to see an image in a mirror, we must be able to connect the image to the eye using a straight line *Reversibility of reflection indicates that our eye will also be seen by the object generating said image

PHS 5041 Optics Plane Mirrors Field of vision All the space in front of a mirror which we are able to see from a given vantage point Can also be determined using the image of the observer

PHS 5041 Optics Plane Mirrors How long? In order to be able to produce the complete image of a person (head-to-toe), a mirror must be HALF of the height of a person

PHS 5041 Optics Plane Mirrors

PHS 5041 Optics Plane Mirrors Applications

PHS 5041 Optics Plane Mirrors Applications

PHS 5041 Optics Plane Mirrors Applications

PHS 5041 Optics Plane Mirrors Applications

PHS 5041 Optics Plane Mirrors How many images can be produced (N)? (Formula that relates N and the angle between two mirrors?) Angle between mirrors (θ) Number of reflection (N) 30 11 45 7 60 5 90 3 180 1 N = (360 / θ) - 1