character: John
topic: Lens Formula Derivation
grade: 10
subject: Physics
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character: Mary
topic: Refraction through Lenses
grade: 10
subject: Physics
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character: David
topic: Understanding Convex and Concave Lenses
grade: 10
subject: Physics
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character: Emily
topic: Applications of Lens Formula in Real Life
grade: 10
subject: Physics
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