When describing image formation in lenses, what is the angle of incidence?
A. The angle the light ray makes in the medium with a lower index of
refraction.
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B. The angle the light ray makes as it strikes the surface.
) C. The angle the light ray makes in the medium with a higher index of
refraction
D. The angle the light ray makes as it leaves the surface.

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)