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A student has the high dry lens in position and appears to be intently observing the specimen The instructor noting a working distance of 1 cm knows the student isn't seeing the specimen How so?
Wiki User
∙ 14y ago
A "high-dry" lens is a "high power, non-oil immersion" lens. As focal depth decreases with magnification, a high power lens would have a much shorter working distance than 1cm. The student is looking at dust floating in the air, not the slide. Crank it down to 1-2mm, refocus and look again.
Wiki User
∙ 12y ago
Wiki User
∙ 14y agoThis is exercise #3, question #11 from Human Anatomy and Physiology Laboratory Manual, 9th ed by Marieb and Mitchell.
A "high-dry" lens is a "high power, non-oil immersion" lens. As focal depth decreases with magnification, a high power lens would have a much shorter working distance than 1cm. The student is looking at dust floating in the air, not the slide. Crank it down to 1-2mm, refocus and look again.
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