2 lenses have their optic powers as -2D and +1.5D their combination will have focal length of a) -1mb)-2mc) +2md)+1m

2 lenses have their optic powers as -2D and +1.5D their combination wi

1.	2 lenses have their optic powers as -2D and +1.5D their combination will have focal length of a) -1mb)-2mc) +2md)+1m
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2 lenses have their optic powers as -2D and +1.5D their combination will have focal length of a) -1mb)-2mc) +2md)+1m​

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2 lenses have their optic powers as -2D and +1.5D their combination will have focal length of a) -1mb)-2mc) +2md)+1m