c urved lenses 13.1, 13.3, 13.4. d iverging lens, c oncave shape f
TRANSCRIPT
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CURVED LENSES13.1, 13.3, 13.4
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DIVERGING LENS, CONCAVE SHAPE
F
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CONVERGING LENS, CONVEX SHAPE
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PATH DEVIATION
Air to glass – bends towards the normal
Glass to air – bends away from normal
RAY CONVERGES
NOTICE THAT THE DEVIATION OF THE LIGHT RAY (X) INCREASES IF THE THICKNESS OF THE LENS INCREASES
X
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F2F F 2F
O
object
OPTICAL CENTRE
2F’ F’
LENS DIAGRAM SET UP
VIRTUAL FOCAL POINT
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F2F F 2F
O
object
HOW DO WE KNOW WHICH SIDE IS REAL AND WHICH SIDE IS VIRTUAL?REMEMBER THAT PREVIOULY THE REAL SIDE IS WHEREVER THE OBSERVER WHO IS SEEING THE IMAGE IS LOCATED…WHEN DEALING WITH LENSES, WHICH SIDE IS THIS?
VIRTUAL REAL
OPTICAL CENTRE
2F’ F’
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F2F F 2F
O
object
2F’ F’
RAY #1: Any ray that is parallel to the PA is refracted through the F
RAY #2: Any ray that pass through F is refracted parallel to PA
RAY #3: Any ray that passes through O continues through
USE SAME CONCEPTS AS THE ONES USED IN MIRRORS
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SPECIAL CASES WITH CONVERGING LENSES (P. 377)
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F2F F 2F
O
2F’ F’
Object beyond 2F’: image is real, inverted, smaller
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F2F F 2F
O
2F’ F’
Object at 2F’: image is inverted, same size, real
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F2F F 2F
O
2F’ F’
Object between F’ and 2F’: image is beyond 2F, real inverted, larger
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F2F F 2F
O
2F’ F’
Object at F’: no image
Light rays remain parallel and don’t converge thus no image formed
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F2F F 2F
O
2F’ F’
Object between lens and F’: image is virtual, erect, larger
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RULES WITH DIVERGING LENSES
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F2F F 2F
object
2F’ F’
RAY #1: Any ray that is parallel to the PA appears to be refracted through the F’
RAY #2: Any ray that appears to pass through F is refracted parallel to PA
RAY #3: Any ray that passes through O continues through