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LIGHT
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TOTAL INTERNAL REFLECTION
LIGHT REFLECTION REFRACTION LENSES TOTAL INTERNAL REFLECTION
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5.1 understanding reflection of light
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By the end of this subtopic, you will be able to;
Describe the characteristics of the image formed by reflection of light State the laws of reflection of light Draw ray diagram to show the positioning and characteristics of the image formed by a plane mirror
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What are the characteristics of the image formed?
RAY DIAGRAM TO DETERMINE THE POSITION AND CHARACTERISTIC OF THE IMAGE FORMED BY A PLANE MIRROR Object, O Image, I Object O placed in front of plane mirror Measure the distance between O and mirror Measure the same distance behind the mirror and mark with I as a image Draw diverging ray from a point on the image, to the corner of the eye. Draw two diverging rays from the object to the mirror to meet the diverging rays from the image What are the characteristics of the image formed?
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Worked Example Plane mirror The figure shows a parrot standing 2.5 m away from a plane mirror. If it fly 0.5 m away from the mirror, what is the new distance between the parrot and it image?
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Application of plane mirror
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CURVED MIRRORS CONVEX MIRROR CONCAVE MIRROR - Principal axis
F C P C F Parallel rays that strike the surface of a concave mirror will be reflected and converge at the focal point Parallel rays that strike the surface of a convex mirror will be reflected and diverge at the focal point - Principal axis - Centre of curvature - Focal point - focal length P C F f
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RAY DIAGRAM FOR CONCAVE MIRROR
Point of intersection is the position of the image, I P C F 1. Draw rays parallel to the principal axis and will be reflected through focal point. 2. Draw a ray through the centre of curvature, C and rays will be reflected at same line/part 3. Draw line pass through the focal point and will be reflected parallel with principal axis
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POSITION OF OBJECT U > C C >U>F U=F U<F
U – object distance U > C C >U>F U=F U<F
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CHARACTERISTIC OF IMAGE
REAL INVERTED DIMINISHED THE CHARACTERISTIC OF IMAGE DEPENDS ON THE OBJECT DISTANCE
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RAY DIAGRAM FOR CONCAVE MIRROR
P C F CHARACTERISTIC OF IMAGE VIRTUAL UPRIGHT MAGNIFIED
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RAY DIAGRAM FOR CONVEX MIRROR
Point of intersection is the position of the image, I P C F 1. Draw rays parallel to the principal axis and will be reflected through focal point. 2. Draw a ray through the centre of curvature, C and rays will be reflected at same line/part
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CHARACTERISTIC OF IMAGE
VIRTUAL UPRIGHT MAGNIFIED THE CHARACTERISTIC OF IMAGE DOES NOT DEPENDS ON THE OBJECT DISTANCE
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APPLICATION OF REFLECTION OF LIGHT
MIRROR IN A METER (plane mirror) Ammeter PERISCOPE MAKE -UP MIRROR (concave mirror) MAGNIFYING MIRROR (concave mirror)- dentist VEHICHEL MIRROR ( convex mirror) Wider field of view
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