Final answer:
The width of Tariq's specimen is calculated by dividing the field diameter of 200 micrometers by the number of times the specimen fits across the field of view, which is 4. Therefore, the width of the specimen is 50 micrometers.
Step-by-step explanation:
To calculate the width of Tariq's specimen, we first need to understand the concept of field diameter. The field diameter of a microscope refers to the visible area one sees through the microscope's eyepiece. Since the field diameter with a 10x ocular lens and a 50x objective lens is 200 micrometers (μm), and Tariq's specimen fits across this field of view about 4 times, we can calculate the width as follows:
Field Diameter = 200 μm
Number of times the specimen fits across the field view = 4
Width of Specimen = Field Diameter ÷ Number of times the specimen fits
Width of Specimen = 200 μm ÷ 4
Width of Specimen = 50 μm
Therefore, the width of Tariq's specimen is 50 micrometers.