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The purpose of diopter adjustment is to _____________?

A) Increase brightness
B) Adjust focus for each eye
C) Increase magnification
D) Fix chromatic aberration

Correct Answer: B) Adjust focus for each eye

Reason: The primary function of the diopter adjustment is to **Adjust focus for each eye**, compensating for the difference in the user's prescription or sight power between the left and right eyes. Related MCQs: **Brightness** is controlled by the diaphragm/light source. | **Magnification** is controlled by switching objective lenses. | It ensures that the image remains crisp and clear in the **binocular view**. | Failure to adjust the diopter can lead to severe **eye strain**.

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