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In a compound microscope, magnification by objective is m_o, eyepiece is m_e. Total magnification:

Am_o - m_e
BJust m_e
Cm_o × m_e
Dm_o + m_e
Answer & Solution
Correct answer: C. m_o × m_e
Total magnification = m_o × m_e. Objective forms a real, enlarged intermediate image which the eyepiece further magnifies (used as a simple microscope).
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