Question

On a snapshot, using the 4x objective, an insect has an on-screen length of 10 cm. The whole picture is 20 cm wide.?What is the actual size of the insect??

Answer #1

**Answer:**

Based on the given information:

- Objective lens magnification used: 4x
- On-screen length of insect (A
_{2}) = 10cm = 100mm - Total width of picture (B
_{2}) = 20cm = 200mm

Actual size of the insect can be calculated using the formula:

- Actual size of the object (A
_{1}) = - A
_{1}= Onscreen size of the object (A_{2}) * [Actual size of the FOV (B_{1}) / On-screen size of the FOV(B_{2})] - Field of view for 4x objective lens (B
_{1}) = 1.80 mm (the greater the magnification, smaller the field of view) - Actual size of the insect = 100 * [(1.80 / 200)] = 0.9mm or 0.09cm

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