Which of the following changes would increase resolution when using the oil immersion lens? Choose all that are correct.
a. Adjust fine focus knob.
b. Use immersion oil.
c. Increase rheostat intensity.
d. Raise condenser.
e. Lower condenser.
f. Open iris diaphragm.
g. Close iris diaphragm.
Answer choices:
A. a, c, e, f
B. a, b, e, g
C. a, b, c, d, f
D. b, c, d, e
2. Why must immersion oil be used with the oil immersion lens?
A. To increase contrast.
B. To increase light refraction to decrease contrast.
C. To decrease light refraction thus increasing resolution.
D. To increase light refraction to increase resolution.
3. To focus a specimen, it is best to start with the ___________ objective lens.
A. Oil immersion.
B. Ocular.
C. High dry.
D. Scanning.
4. What is the function of the iris diaphragm and substage condenser?
A. To focus using oil immersion lens.
B. To move slide left to right.
C. To move stage up and down.
D. When opened and raised, increases light focused on specimen thus increasing resolution.
5. When using the high dry or oil immersion lens, which focus adjustment knobs should never be used?
A. Fine focus adjustment knob.
B. Medium focus adjustment knob.
C. Low focus adjustment knob.
D. Coarse focus adjustment knob.