character: Mr. Brown
topic: The Science of Focal Length
grade: 9
subject: Physics
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character: Mr. Green
topic: Understanding Lenses and Mirrors
grade: 9
subject: Physics
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character: Ms. Smith
topic: Applications of Focal Length in Optics
grade: 9
subject: Physics
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character: Dr. White
topic: Refraction and Focal Length Relationships
grade: 9
subject: Physics
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