For stand magnifiers, the object-to-lens distance is fixed. Which statement describes this?

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Prepare for the NBEO Physiological Optics Test with flashcards and multiple choice questions, each offering hints and explanations. Equip yourself for your exam!

Multiple Choice

For stand magnifiers, the object-to-lens distance is fixed. Which statement describes this?

Explanation:
Stand magnifiers position the lens at a fixed height above a stage, so the distance from the object on the stage to the lens is locked in by the stand’s geometry. Because that working distance can’t be varied during use, the magnification is fixed for a given lens. To change magnification, you’d swap to a lens with a different focal length or adjust the stand design, not freely change the object-to-lens distance.

Stand magnifiers position the lens at a fixed height above a stage, so the distance from the object on the stage to the lens is locked in by the stand’s geometry. Because that working distance can’t be varied during use, the magnification is fixed for a given lens. To change magnification, you’d swap to a lens with a different focal length or adjust the stand design, not freely change the object-to-lens distance.

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