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A student measures the thickness of a human hair by looking at it through a microscope of magnification 100. He makes 20 observations and findsd that the average width of the hair in the field of view of the microscope is 3.5mm. What is his estimate on the thickness of hair?

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Solution :
Magnification of the microscope = 100 Average width of the hair in the field of view of the microscope = 3.5 mm `:.` Actual thickness of the hair is`3.5/100= 0.035 mm`

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