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Q.

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 is 3.5 mm. What is thickness of the hair?

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a

0.0035 mm

b

0.035 mm

c

0.01 mm

d

0.7 mm

answer is B.

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Detailed Solution

Magnification is 100. Hence, the thickness of hairt=3.5100=0.035 mm
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