An achromatic lens is made of two very thin lenses, placed in contact, that have focal lengths f_1 = -27.8 cm and f_2 = +25.3 cm . a) Is the combination converging or diverging? b) What is the net focal length?

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An achromatic lens is made of two very thin lenses, placed in contact, that have focal lengths f1=−27.8 cmf_1 = -27.8 \textrm{ cm}f1​=−27.8 cm and f2=+25.3 cmf_2 = +25.3 \textrm{ cm}f2​=+25.3 cm.

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An achromatic lens is made of two very thin lenses, placed in contact, that have focal lengths $f_1 = -27.8 \textrm{ cm}$ and $f_2 = +25.3 \textrm{ cm}$ .