Converging Lenses: Magnification

Two 25.0 cm focal-length converging lenses are placed 16.5 cm apart. An object is placed 30.0 cm in front of one. Where will the final image formed by the second lens be located? What is the total magnification?

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...he first lens :

1/v - 1/u = 1/f

u = - 30.0 cm
f = + 25.0 cm

Substitute values of u and f with signs in the above equation to get v= + 150 cm. Had there been no second converging lens, the image would have been 150 cm beyond the first lens. But the rays are intercepted by the ...