Question

iii. observing the letter e (4 marks)
a. turn on the microscope and place the slide on the stage. use the clips to secure it.
b. using the low power objective, turn the coarse focus until the letter e can be seen.
c. use the fine focus to focus clearly.
d. draw what you see.
how is the letter e positioned?
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e. looking through the eye piece, move the slide to the right.
what direction does the letter move? ________________________
f. looking through the eye piece, move the slide up, away from you.
what direction does the letter move? ________________________
g. re - center the slide and change the objective to medium power. do not touch the coarse focus. use the fine focus to focus.
h. draw what you see. (3 marks)
i. do you see more or less of the letter e under medium power?
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________________________
locate the diaphragm under the stage. move it around. what do you notice?
________________________
________________________

Explanation:

• For "How is the letter e positioned?": Under a microscope, the image is inverted. So the letter "e" will be upside - down.
• For "Looking through the eye piece, move the slide to the right. What direction does the letter move?": The image in a microscope moves in the opposite direction. When the slide is moved to the right, the image moves to the left.
• For "Looking through the eye piece, move the slide up, away from you. What direction does the letter move?": When the slide is moved up, the image moves down.
• For "Do you see more or less of the letter e under medium power?": As the magnification increases (from low to medium power), the field of view decreases. So you see less of the letter "e".
• For "Locate the diaphragm under the stage. Move it around. What do you notice?": The diaphragm controls the amount of light. When moved, the brightness of the image changes.

Answer:

• How is the letter e positioned? Upside - down.
• Looking through the eye piece, move the slide to the right. What direction does the letter move? To the left.
• Looking through the eye piece, move the slide up, away from you. What direction does the letter move? Down.
• Do you see more or less of the letter e under medium power? Less.
• Locate the diaphragm under the stage. Move it around. What do you notice? The brightness of the image changes.