The image is inverted and virtual.
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It means that the pre-image and image are on opposite sides of the centre of magnification.
it would be 15 times 40 which is 600 times magnification
One can calculate the total magnification of a microscope by multiplying the magnification of the eye piece by the magnification of the main scope. For a compound microscope one must multiply each eye piece magnification.
LED's are DC voltage. Transformers are AC voltage. There is no positive or negative on AC voltage. You would need a diode to change the AC to DC, then there would be positive and negative voltages.
They correspond to linear sequences.