A point object in air is in FIGUREront o...

A point object in air is in FIGUREront oFIGURE the curved surFIGUREace oFIGURE aplano-convex surFIGUREace is 30cm and the reFIGUREractive index oFIGURE the lens material is 1.5, then the FIGUREocal length oFIGURE the lens(in cm) is

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