Question

question 17
which of these procedures would minimize eye strain while looking through the microscope?

• always wear glasses.
• use the low power objective whenever you can.
• keep both eyes open through the ocular.
• close the diaphragm and/or condenser.

question 18
if the letter b is placed under the microscope in its normal reading position, how would this image appear when viewing it through the microscope?

• the letter b.
• the letter d.
• the letter p.
• the letter q.

Explanation:

For Question 17: Keeping both eyes open prevents muscle fatigue from forcing one eye closed, which minimizes eye strain. Wearing glasses is not necessary for all users, low power objective does not affect eye strain, and adjusting diaphragm/condenser controls light, not strain.
For Question 18: Microscopes produce images that are inverted and reversed (rotated 180 degrees). A normal "b" rotated 180 degrees appears as "q".

Answer:

Question 17: C. Keep both eyes open through the ocular.
Question 18: D. The letter q.