Using an eye piece graticule and stage micrometer

A student workbook with A Level examination questions along with an accompanying teacher PowerPoint which explains how to solve the questions.

The resource goes through several calculations and question types involving a stage micrometer and eyepiece graticule. The PowerPoint and student workbook both have a step by step example of how to calibrate an eyepiece graticule and then how to use the same eyepiece graticule to measure cells and cellular components. The size of cells and organelles are measured using the micrometre (μm) scale. One question also asks student’s to calculate magnification (M) when both the size of the image (I), and the actual size of the specimen (A), is known. A starter activity where students label the parts of a light microscope is also included in both the PowerPoint and student workbook

The A Level OCR examination questions give students practice in calibrating an eyepiece graticule and use images from microscopes. The student booklet contains 6 questions and a range of different question types (calculation, written response and multi-choice) where students use their calculations of the eyepiece graticule to calculate the actual size of some real example images. Useful for exam practice and to build understanding of a tricky topic. Answers included in the animated PowerPoint so that the teacher can explain each step in the calculation. There is also a teacher version of the student workbook with a full mark scheme and examiner’s feedback.