The Surgical Microscope Is Often Used to Provide Illumination and Magnification

question 13

Multiple Choice

The surgical microscope is often used to provide illumination and magnification for complex procedures to the ear,laryngeal surgery,or reconstructive free flap procedures following neck surgery.A common eyepiece magnification for an otologic microscope is ´12.5,and the usual objective (lens) is ______-mm focal length (f) .A _______-mm lens is used for laryngeal surgery.

• A) 250- or 300; 400
• B) 400; 150
• C) 150; 400
• D) 400; 250 or 300

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