Measure the focal length of a concave mirror
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9 Terms
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Label This Diagram
a - light box
b - card
c - v
d - concave mirror
e - metre ruler
f - u
g - cross hatching
2
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Method • 1
Move card back and forth until a sharp image of the cross hatching is formed
Measure and record u and v
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Method • 2
Change image distance
Repeat previous steps
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Method • 3
Calculate focal length
For each set of values calculate the average focal length
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Precautions • 1
Keep card close to ruler to measure v accurately
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Precautions • 2
Keep card vertical
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Precautions • 3
Measure u and v from the back of the mirror
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Label this formula
Mirror and lens formula
f - focal length
v - image distance
u - object distance
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What page of the log tables can you find the Mirror and Lens Formula?
60
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