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Observe the given figures carefully. The given figures show the path of light through lenses of two different types, represented by rectangular boxes \(A\) and \(B\). What is the nature of lenses \(A\) and \(B\)?
Lens \(A\)
The nature of lens \(A\) is .
Lens \(B\)
The nature of lens \(B\) is .
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