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[" a."2:2:1],[" c."1:2:2],[" 28Two thin ...

[" a."2:2:1],[" c."1:2:2],[" 28Two thin lenses of focal lengths "20cm" and "25cm_(A)" ."2.1cm],[" placed in contact.The effective power of "1fthe" focal "],[" placed in contact.The e "3D" d.7D away fro "],[" formed "],[" a."90" .What equex lens of focal length "f" an "]

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