Question

. A lens of focal length +15.0 cm is 10.0 cm to the left of a...

. A lens of focal length +15.0 cm is 10.0 cm to the left of a second lens of focal length ?15.0 cm. (a) Where is the final image of an object that is 30.0 cm to the left of the positive lens? (b) Is the image real or virtual? (c) How do the images size and orientation compare to those of the original object? Explain your answer.

The answer to part A is 60cm but I need helping figuring how to get that answer, along with the rest of the answers to the question :)

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