In a compound microscope, the objective has a focal length of 0.50 cm, while the eyepiece has a focal length of 1.9 cm. the separation between the objective and the eyepiece is l = 14.0 cm. another microscope that has the same angular magnification can be constructed by interchanging the two lenses, provided that the distance between the two lenses is adjusted to a value l'. what is l' ?

Air initially at 0.75 bar, 1000 k, and occupying a volume of 0.12 m^3 undergoes two processes. process 1-2: the air is compressed isothermally until the volume is halved. process 2-3: the air undergoes a constant pressure process until the volume is halved again. assume ideal gas behavior. a) determine the mass of the air, in kg. b) the work and the heat transfer for each of the two processes, in kj. (100 kj = 1 bar . m^3)