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15. Lily examine a specimen but there was no image being viewed because the
A. Yes, Lily should adjust the objective lenses because it is responsible
in providing light.
B. Yes, Lily should adjust the objective lenses because she can choose
between low power and high power.
C. No, Lily should adjust the diaphragm and the mirror because these
parts are responsible in providing of light,
D. No, Lily should adjust the fine adjustment knob and coarse
adjustment knob because these parts are for giving light.​