Question

On a snapshot, using the 4x objective, an insect has an on-screen length of 10 cm....

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??

Homework Answers

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
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