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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
A converge lens of focal length 50 cm
b
A divergent lens of focal length 100 cm
c
A convergent lens of focal length 100 cm
d
A convergent lens of focal length 200 cm

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detailed solution

Correct option is C

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


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