Question

how do you calculate magnification on a light microscope?
multiplying the power of the eyepiece lens by the highest power of objective lens available gives you the total number of times an object will be magnified.
multiplying the power of the eyepiece lens by the nosepiece lens in use gives you the total number of times an object will be magnified.
multiplying the power of the eyepiece lens by the lowest powered objective lens gives you the total number of times an object will be magnified.
none of these
question 2
2 pts
explain how to focus a microscope using the high - power lens.
1st: locate the specimen using the low - power objective lens; 2nd: switch to the high - power objective lens; 3rd: use only the fine focus knob to sharpen the lens.
1st: locate the specimen using the high - power objective lens; 2nd: switch to the low - power objective lens; 3rd: use only the fine focus knob to sharpen the lens.

Explanation:

For the first question, the total magnification of a light - microscope is calculated by multiplying the power of the eyepiece lens by the power of the objective lens in use. It is not just the highest or lowest power of the objective lens, and the nosepiece is not a lens for magnification calculation. For the second question, when using a high - power lens on a microscope, first locate the specimen with the low - power objective lens, then switch to the high - power objective lens, and use only the fine focus knob to sharpen the image as using the coarse focus knob can damage the specimen or the lens.

Answer:

Question 1: None of these
Question 2: 1st: Locate the specimen using the low - power objective lens; 2nd: switch to the high - power objective lens; 3rd: Use only the fine focus knob to sharpen the lens.