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📊 Statistics
Total Magnification: ×40
Microscope: Light
Resolution: ~200 nm
Specimen size: ~20 μm
Current View
Knowledge Check — Topic 2.1
Score: 0 / 10
Question 1 of 10
Calculate the Magnification
A drawing measures 45 mm. The actual cell diameter is 30 μm.
💡 Convert first: 1 mm = 1000 μm
Calculate the Actual Size
Image is 54 mm wide at ×900.
Eyepiece Graticule Calibration
Stage mic. (10 μm/div) spans 40 divs aligned with 50 eu.
Formula Reference
M = Image size ÷ Actual size
A = Image size ÷ Magnification
I = Actual size × Magnification
1 mm = 1,000 μm
LM
Specimen
🫦
Human Cheek Cell
Inner cheek swab
🧅
Onion Epidermal
Onion inner skin
🌿
Elodea Leaf
Pond weed leaf
🩸
Blood Smear
Prepared slide
💡 Cheek cells: scrape gently with a clean cotton bud, smear on a slide.
Objective Lens
Eyepiece Lens
×10
Eyepiece magnification
Focus (Coarse Knob)
Rotate to focus
In Focus ✓
Light Intensity (Diaphragm)
Lamp
Bright (75%)
Stain (select one)
None
(Unstained)
(Unstained)
Methylene Blue
Iodine Solution
Safranin
✓ Unstained
Eyepiece Graticule
✓ Graticule overlay active
