Calculating Cell Size and magnification- Answers - Magnification ... - Free Printable

Let’s solve Question 2 step by step, just like we did for the fly in Question 1.

We are told:
- The actual size of the red blood cell is 300 µm.
- We need to find the magnification.

The steps are:

---

Step 1: Measure the image size using a ruler in millimetres (mm)
From the worksheet, it says:
→ Length of cell is 39 mm

*(Note: This measurement would normally be done with a physical ruler on the printed page. Since this is given, we’ll use it.)*

---

Step 2: Convert millimetres (mm) into micrometres (µm)
We know:
→ 1 mm = 1000 µm
So:
→ 39 mm × 1000 = 39,000 µm

This is the image size in micrometres.

---

Step 3: Divide image size by actual size to get magnification
Magnification = Image size ÷ Actual size
→ Magnification = 39,000 µm ÷ 300 µm

Let’s calculate that:

39,000 ÷ 300 = ?

You can simplify:
Divide both numbers by 100 → 390 ÷ 3 = 130

So, magnification = 130 X

That means the picture shows the cell magnified (zoomed in) by 130 times.

---

Final Answer:
130