Physics XF: Convex Lens
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Hansen , Trevin , Meiga , Carissa
CONVEX LENS
IMMANUEL CHRISTIAN SCHOOL (SENIOR HIGH) BILINGUAL CLASS
GRADE X 2012-2013
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What is Convex lens??
Transparent mediumUsed in toolsHipermethropy (near-sighted)
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CONVEX & CONCAVE LENS
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SPECIAL RAYS
2F1 F1 F2 2F2
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2F1 F1 F2 2F2
Between focal point and the lens
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2F1 F1 F2 2F2
Between 2F1 and F1
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2F1 F1 F2 2F2
Beyond 2f
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Object positio
n
Image positio
n
Larger, smaller, or same
size?
Upright or
inverted?
Virtual or real ?
Between F and the lens
Between F and
2F1
larger upright Virtual
Between 2F
and F
More than 2F2
Larger Inverted Real
Beyond 2F
Between F2 and 2F2
smaller Inverted Real
Convex lens
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Note:f = focal length (+)S = object distanceS’ = image distance
1𝑓=1𝑆 ′
+1𝑆
A. Relations between object lengths and image lengths
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𝑀=|h′h |=|𝑠 ′𝑠 |Note :M = magnificationh = height objecth’ = height images = object distances’ = image distance
B. Image magnification
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e.gA convex lens has 20 cm of focal length. With the object placed 10 cm in front of the lens. Determine the image position , the magnification, and the characteristics of the image of an object.
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POWER OF LENS
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Examples:
Q: the focal length of a convex lens is 5 cm. What is the optical power of lens?
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History of formulaa
2F1 F1 F2 2F2
1𝑓=1𝑆 ′
+1𝑆
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The focal length of a convex lens is 12 cm. An object is placed in front of the lens, Determine :a.) The image lengthb.) The magnification of the imagec.) The power of lensd.) Ray diagrame.) The size of the image if the object size is 12 cm
Q :RECALLING
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An object with 5 cm in height is put in front of a converging lens.The image formed is located 12 cm behind the lens and it is 15 cm in height. Find the power of lens. And draw the diagram.
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THANK YOU