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 (A₂) = 10cm = 100mm
• Total width of picture (B₂) = 20cm = 200mm

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

• Actual size of the object (A₁) =
• A₁ = Onscreen size of the object (A₂) * [Actual size of the FOV (B₁) / On-screen size of the FOV(B₂)]
• Field of view for 4x objective lens (B₁) = 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