Author Question: What is the purpose of the blue filter when using a tungsten-halogen microscope light? a. ... (Read 157 times)

KimWrice · **on:** Jun 25, 2018

What is the purpose of the blue filter when using a tungsten-halogen microscope light?

a. Eliminate blue color
b. Eliminate yellow color
c. Reduce light intensity
d. Filter out stray light

Question 2

Which of the following would be least likely to cause a fuzzy image on oil power?

a. Using a plan-achromatic objective lens
b. Objective not screwed in tightly
c. Not enough oil on the slide when using oil immersion lens
d. Focus controls not adjusted

voltaire123 · **Reply #1 on:** Jun 25, 2018

Answer to Question 1

ANS: B
A blue or daylight filter is used to eliminate the yellow color emitted by tungsten-halogen light bulbs.

Answer to Question 2

ANS: A
When an objective is not screwed in tightly, not enough oil has been used on a slide when using an oil immersion lens, or the focus controls are not adjusted, an image is likely to be fuzzy or unclear, making it difficult to visualize objects. Using a plan-achromatic lens gives a flat field so that the edges of the field are in focus at the same time as the center.