lens of focal length 40cm and -20cm find nature and power of each lens
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F=40cm=40/100m=0.4m
P=1/0.4=+2.5D
F=-20cm=-0.2m
P=(-1/0.2)=-5D
P=1/0.4=+2.5D
F=-20cm=-0.2m
P=(-1/0.2)=-5D
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