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[8" Two lenses of power "+12" and "-2" d...

[8" Two lenses of power "+12" and "-2" dioptres are "],[" placed in contact.The combined focal length "],[" of the combination will be...."],[" (A) "8.33cm],[" (B) "1.66cm],[" (C) "12.5cm],[" D) "10cm]

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