A 6.77-mm-high firefly sits on the axis of, and 13.5 cm in front of, the thin le

Question

A 6.77-mm-high firefly sits on the axis of, and 13.5 cm in front of, the thin lens A, whose focal length is 6.83 cm. Behind lens A there is another thin lens, lens B, with focal length 23.1 cm. The two lenses share a common axis and are 56.9 cm apart. Is the image of the firefly that lens B forms real or virtual? How far from lens B is this image located (expressed as a positive number)? What is the height of this image (as a positive number)? Is this image upright or inverted with respect to the firefly?

Explanation / Answer

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