A lens of power +2 diopter is placed in contact with a lens power -1 diopter. The combination will behave like

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A converge lens of focal length 50 cm

A divergent lens of focal length 100 cm

A convergent lens of focal length 100 cm

A convergent lens of focal length 200 cm

answer is C.

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Detailed Solution

P=P1+P2=+2−1=+1 dioptre, lens behaves as convergent ,F=1P=11=1 m=100 cm.

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