Transillumination functions on the principle that:
a. air, fluid, and tissue transmit light diffe-rentially.
b. black light causes certain substances to fluoresce.
c. converging and diverging light brings structures into focus.
d. tangential light casts shadows that illumi-nate contours.
A
Transillumination functions to differentiate between various media in a cavity. It can distinguish among air, fluid, and tissue.
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