Unit 3 Biology Lab 3

Biology 15

Lab # 3

Professor Passerini

September 23, 2015

Scot Albert

Lab #3

Questions 1, 2a, 3, 4, 5, 6a, 7, and 8

Table 3.1 - all columns except the last one.

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1-

a-Upside down and backwards

b- If you move it right, the image moves left

If you move it left, the image moves right

c-It seems to become more dim.

(At least to my eyes.)

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2a- 400x larger than life

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3-

a-10x

b-40/4=10 ratio of width

10^2=100 ratio of area.

You should be able to see

100x more area with the 40x setting.

c-This is due to two things;

1-you are tightening your field of view.

2-When you do this,

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7-

a- Stereo microscope magnifications can range from as little as 2x up to 30x, but typically might be between

20x and 80x, depending on what you are looking at, of course.

(I am assuming our units are comparably average.)

9 mm @ 20x

b-Given what I have typed above, I will say that they can range from 80x to 300x.

(Though for this question this is the magnification NOT the FOV.)

(I am assuming our units are comparably average.)

20 mm @ 10x, 5 mm @ 40x

c-It appears in normal reading orientaion. That is to say right side up.

d-If you move the sample right it moves to the right.

If you move the sample to the left, it moves to the left.

Another source said:

(Because of the typical usage of this type of

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8-The main difference between a dissecting microscope and a compound microscope is that a dissecting microscope views surface features of a specimen, whereas compound microscopes are designed to look through a specimen. Also, a dissecting microscope uses light from above whereas, a compound microscope use light from below the sample. One other thing, the compound units we use have settings of 10x, 20x, 40x and 100x (which we are NOT to use.) The dissecting units aka scanning generally have 2 main setting which I believe are 15x and 30x.

(They in some cases go up to 45x.)

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Table 3.1 - all columns except the last one.

Obj. Pwr. Obj. Mag. Occ. Mag. Total Mag. FOV Dia.(mm) FOV Area (mm^2) 10 10 10 100 2mm 4mm^2

20 20 10 200 1mm 1mm^2

40 40 10 400 .5mm