A 6.25 mm high firefly sits on the axis of, and 12.9 cm in front of, the thin lens A, whose focal length is 6.79 cm. Behind lens A there is another thin lens, lens B, with a focal length of 23.9 cm. The two lenses share a common axis and are 56.3 cm apart. a) Is the image of the firefly that lens B forms real or virtual?. b) How far from lens B is this image located? Express the answer as a positive number. c) What is the height of this image? Express the answer as a positive number. d) Is this image upright or inverted with respect to the firefly?

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