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 is 3.5 mm. What is the estimate on the thickness of the hair:

(a) 0.0035 mm (b) 0.035 mm

(c)0.01 mm (d) 0.7 mm

Answer 1

Solution :
Given that magnification = 100
Average width of the hair in the field of view of the microscope is 3.5 mm
Actual estimate thickness of hair = average width on field of view / magnification
=3.5 mm / 100 = 0.035 mm

Answer: estimate on the thickness of hair =(b) 0.035 mm