High School

The image shows a dust mite as seen under a microscope. The scale of the drawing to the dust mite is 100:1.

Use a ruler to measure the length in millimeters. What is the actual length of the dust mite?

Answer :

The actual length of the dust termite observed under the microscope is 1.5 mm

  • The scale of image produced under the microscope 100 : 1

  • This means image is magnified 100 times its original size as microscopes are used to enlarge or magnify the size objects.

  • Taking the measured size of the dust termite under the microscope in millimeter = 150 mm

The actual length of the termite will be :

Measured size under microscope ÷ 100

150 mm ÷ 100

1.5 mm

Therefore, the actual length of the dust termite is about 1.5 mm

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