Question

A student measures the thickness of a human hair by looking at it through a microscope of magnification 100. He makes 20 observations and finds that the average width of the hair in the field of view of the microscope is 3-5 mm. What is his estimate on the thickness of hair ?​

Answer 1

Magnification=  100.

Avg. width in Microscope =3.5 mm

So,

Original width = 100/3.5mm​=0.035mm

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