Question

question 19
which of the following statements is incorrect about microscope use?

• more light is necessary when using the scanning objective
• when using the coarse adjustment, the objective should not touch the slide
• the compound microscope consists of a two - lens system
• the low power objective has a greater magnification than the scanning objective

question 20
which magnification has the greatest field of vision?

• 4x
• 10x
• 40x
• 100x

Explanation:

For Question 19:

• Scanning objectives have the lowest magnification, so they need the least light; higher magnification objectives require more light. The other statements are correct: coarse adjustment should not let the objective touch the slide to avoid damage, compound microscopes use an ocular and objective lens (two-lens system), and low power (typically 10x) has greater magnification than scanning (typically 4x).

For Question 20:
Field of vision (the area visible through the microscope) is inversely related to magnification. Lower magnification means a wider, larger field of view, so 4x (the lowest magnification listed) has the greatest field of vision.

Answer:

Question 19: A. More light is necessary when using the scanning objective
Question 20: A. 4x