3. (1pt.) What is the total magnification of the following? 4. (0.5pt.) What is the function of the iris diaphragm? 5. (0.5pt.) What is the function

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3. (1pt.) What is the total magnification of the following? 4. (0.5pt.) What is the function of the iris diaphragm? 5. (0.5pt.) What is the function of the field diaphragm?