Eyepiece Graticule and Calibration

This video tutorial explains how to calibrate an eyepiece graticule in a microscope and why it's necessary. It covers the effects of magnification on measurements, the use of a stage micrometer for calibration, and how to measure objects accurately. The tutorial also discusses recalibrating for different objective lenses to ensure precise measurements.

What is the primary purpose of an eyepiece graticule in a microscope?

• To provide a scale for measuring objects

• To change the color of the image

• To adjust the focus of the microscope

• To magnify the object being observed

Why does the eyepiece graticule scale remain unchanged when magnification is increased?

• Because it is not affected by light

• Because it is automatically adjusted

• Because it is part of the stage micrometer

• Because it is located above the objective lenses

What is a stage micrometer used for in microscopy?

• To provide a known scale for calibration

• To clean the microscope lenses

• To hold the specimen in place

• To increase the magnification

How is the distance between divisions on a stage micrometer typically measured?

• In inches

• In centimeters

• In millimeters

• In meters

What is the first step in calibrating an eyepiece graticule using a stage micrometer?

• Adjust the microscope's light source

• Align the left-hand divisions of both scales

• Increase the magnification to the maximum

• Place the specimen on the stage

Why is it important to calibrate the eyepiece graticule for each objective lens?

• Because each lens has a different shape

• Because each lens is made of different material

• Because each lens has a different magnification

• Because each lens has a different color

What is the value of one eyepiece graticule unit at a magnification of 40x?

• 1 millimeter

• 99.9 micrometers

• 50 micrometers

• 10 micrometers

How do you calculate the actual length of an object using a calibrated eyepiece graticule?

• By multiplying the number of units by the calibration factor

• By adding the number of units to the calibration factor

• By dividing the number of units by the calibration factor

• By subtracting the number of units from the calibration factor

What is the length of a cell measured at 100x magnification if it is 2.5 eyepiece graticule units long?

• 50 micrometers

• 96.15 micrometers

• 38.46 micrometers

• 10 micrometers

Why is it important to be precise when calibrating the eyepiece graticule?

• To reduce the size of the microscope

• To increase the brightness of the image

• To make the microscope look more professional

• To ensure accurate measurements of objects