1.

Two lenses of focal length 20cm and -40cm are co -axially in contact find power of the combination

Answer»

Power will be P=1/F1+1/f2F1=20/100=0.2mand F2=-40/100=-0.4mhenceP=1/0.2-1/0.4=0.2/0.08=2.5D



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