A lens of power \( +2.0 \mathrm{D} \) is placed in contact with another lens of power \( -1.0 \m....

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A lens of power \( +2.0 \mathrm{D} \) is placed in contact with another lens of power \( -1.0 \mathrm{D} \). The combination will
\( \mathrm{P} \)
behave like
W
(1) a converging lens of focal length \( 100 \mathrm{~cm} \).
(2) a diverging lens of focal length \( 100 \mathrm{~cm} \).
(3) a converging lens of focal length \( 50 \mathrm{~cm} \).
(4) a diverging lens of focal length \( 50 \mathrm{~cm} \).


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