4.1 Cell Biology Lesson 3.

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Viewing and Drawing Cells. In this lesson you will: n learn to focus a microscope n learn how to properly label a drawing n learn to calculate magnification.

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Presentation transcript:

4.1 Cell Biology Lesson 3

REQUIRED PRACTICAL 1 Microscope drawings Learning objective: all students must measure the objective of 3 magnifications using a graticule, produce an accurate microscope drawing of an onion epithelial slide and calculate the magnification of their drawing.

Rules for microscope drawings: Write a clear heading. Use a sharp HB pencil. Draw firm continuous lines and avoid using too much shading. Include magnification of the lenses you have used (Magnification of sample = eyepiece lens x objective lens). Draw label lines horizontally with a ruler. These must touch the structure you are labelling but not cross other lines. Calculate the magnification of your drawing using the magnification equation: Magnification = image size ÷ actual size (your drawing) (actual size of cell)