a convex lens of focal length 40 cm is placed is contact with a concave lens of focal length 25 cm what is the power of the combination?
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Power of the convex lens(P1)=2.5D
Power of the concave lens(P2)= -4D
P=P1+P2
=(2.5+(-4))D
=(2.5-4)D
=-1.5D
Therefore the power of the combination is -1.5D
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