(Solved): How far from -56.0-mm-focal-length lens must an object be placed if its image is to be magnified 3.5 ...

How far from

-focal-length lens must an object be placed if its image is to be magnified

and be virtual? Follow the sign conventions. [Hint: Consider real objects and virtual objects (formed by some other piece of optics)] Express your answer to three significant figures and include the appropriate units.

X Incorrect; Try Again; 4 attempts remaining Part B How far from

-focal-length lens must an object be placed if its image is to be magnified

and be real? Follow the sign conventions. [Hint: Consider real objects and virtual objects (formed by some other piece of optics)]