A lens of power \( +2 \) dioptres is placed in contact with a lens of power \( -1 \) dioptre. Th...

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A lens of power \( +2 \) dioptres is placed in contact with a lens of power \( -1 \) dioptre. The combination will behave like
(A) A convergent lens of focal length \( 50 \mathrm{~cm} \)
(B) A divergent lens of focal length \( 100 \mathrm{~cm} \)
(C) A convergent lens of focal length \( 100 \mathrm{~cm} \)
(D) A convergent lens of focal length \( 200 \mathrm{~cm} \)
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