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4. How do you measure the focal length? You measure from the top of the lens to the focal point You measure from the middle of the lens to the focal point You measure from the edge of the lens to the focal point You measure from the light source to the focal point

4. How do you measure the focal length? You measure from the top of the lens to the focal point You measure from the middle of the lens to the focal point You measure from the edge of the lens to the focal point You measure from the light source to the focal point

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4. How do you measure the focal length? You measure from the top of the lens to the focal point You measure from the middle of the lens to the focal point You measure from the edge of the lens to the focal point You measure from the light source to the focal point
Transcribed Image Text:4. How do you measure the focal length? You measure from the top of the lens to the focal point You measure from the middle of the lens to the focal point You measure from the edge of the lens to the focal point You measure from the light source to the focal point
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