When a convex lens and concave length are placed side by side what is the equivalent power and combined focal length?
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Power ( Convex lens ) = +D = + 1/f
Power ( Concave lens ) = - D = - 1/f
Focal length ( Convex lens ) = +f
Focal length ( Concave lens ) = - f
Power ( Concave lens ) = - D = - 1/f
Focal length ( Convex lens ) = +f
Focal length ( Concave lens ) = - f
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