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Published byDale Ralph Gordon Modified over 8 years ago
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mirrors
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What is a plane mirror? ● Its a plain mirror! (But called a plane mirror...) ● Its a FLAT and SMOOTH mirror, like many in your home. ● The reflection should be the ● same as the object! ●
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Plane Mirrors ● In a plane mirror, we are the same height, and we appear to be the same distance away on the other side of the mirror. The image should be a more accurate reflection than this!
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Left or Right? ● In a plane mirror, your right arm looks like your left, and your left arm looks like your right.
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SO..... ● Images in a plane mirror are: – Oriented properly – Reversed – Same size – Same distance
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How do we see images in a plane mirror? ● 1. Light hits an object. ● 2. Light reflects off the object in all directions, hitting the mirror as well. ● 3. Light rays then reflect off of the mirror, and this is what our eyes see ● 4. But the object seems to be coming from behind the mirror..... ● WHY???????
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Our brain thinks light always travels in a straight line! ● Since the light rays seem ● to be coming straight from ● behind the mirror, the object ● also seems to be coming ● from behind the mirror.
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CONCAVE Mirrors ● Curve inward (like in a cave!) ● Reflect light, but differently ● Light rays reflect ● and then converge ● together at a ● focal point. ● This is called ● CONVERGING
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Only Draw 2 Lines to Find Image! ● Draw a line from the object to the mirror, and then through the focal point ● Draw a second line from the object through the focal point to the mirror, and then reflect off straight outwards
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CONCAVE ● The image will depend on how close the object is to the focal point ● Object far ● away from ● focal point, ● image is ● small and ● upside down
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CONCAVE ● If the object is close to the focal point, the object will be upside down but larger.
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CONCAVE ● If the object is inside of the focal point, the object will be virtual, on the other side of the mirror. It will also be large and upright!
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Why use concave mirrors? ● If bright light is placed at the focal point, all of the light rays will reflect off of the mirror in parallel rays. This will produce super INTENSE light! ● This can be used for: – Lighthouses – Spotlights – Car Headlights – Telescopes
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CONVEX MIRRORS ● Convex mirrors bend outwards ● Parallel light rays hit ● a convex mirror and ● then reflect in a ● direction as if they ● came from behind ● the mirror.
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They are DIVERGING! ● The light rays are diverging, rather than converging.
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Images ● Images in convex mirrors will always be: – Smaller – Upright
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2 Cool Things ● Objects will ALWAYS be smaller than they appear ● You will always see WAY MORE images than any other kind of mirror
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Uses? ● Security Camera ● Review Mirror ● Staircases ● Corners ● Decorative
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Ray Diagram for CONVEX ● Convex is more difficult to draw, because all of the lines are DIVERGING. The only come together at a point behind the mirror ● http://www.youtube.com/watch?v=tYuOCswkm3g
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Draw 2 Lines ● Draw the first line parallel to the mirror, and the pretend you are drawing down to the focal point ● Draw the second line as if you were going to the focal point, but then bounce back off the mirror in a parallel line ● Extend ALL lines until they cross!
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