Preview. The objective lens gathers light from the specimen, which is focused to produce the real image that is seen on the ocular lens. Author: Created by GJHeducation. When this number is less than one, it refers to a reduction in size, sometimes called minification or de-magnification.. Plug your data into the formula and solve. In the science of optics, the magnification of an object like a lens is the ratio of the height of the image you can see to the height of the actual object being magnified. The PowerPoint and accompanying resources have been designed to cover the 3rd part of point 2.1.3 … Compound microscopes use two or more lenses to magnify the specimen. Last updated: 19/04/2020 . Course Home Expand All. This is where the magnification calculation is necessary. Created: Jun 29, 2020 | Updated: Jul 29, 2020. For instance, a lens that makes a small object appear very big has a high magnification, while a lens that makes an object appear small has a low magnification. Private: CCEA GCSE Science – Biology higher Cells GCSE Biology – Magnification calculations. GCSE Biology – Magnification calculations. Calculation of Magnification: To calculate the linear magnification of a drawing or image, the following equation should be used: M agnification = I mage size (with ruler) ÷ A ctual size (according to scale bar) Calculation of Actual Size: To calculate the actual size of a magnified specimen, the equation is … This is a line drawn near the photograph or drawing which has a label showing the actual length of the bar before being magnified. A simple microscope uses a single lens, therefore, the magnification of a simple microscope doesn’t need any calculation because the single lens is usually labeled. Magnification formula (AQA A-level Biology) (no rating) 0 customer reviews. Calculating Compound Lens Magnification. Formula to calculate magnification. If your answer is greater than 1, that means the image is magnified. Okay, so let's take a minute to discuss calculating magnification. The eyepiece or ocular lens, is placed near the focal point of the objective to magnify this image. Microscopes magnify an image by use of lens found in the eye-piece, which is also known as the ocular lens. Learning Objectives -I can calculate magnification ), ) Course Navigation. If your answer is between 0 and 1, the image is smaller than the object. Magnification can be calculated using a scale bar. The image is further magnified by the objective lens.Thus the magnification of a microscope is: magnification power of the eye-piece multiplied by the power of the objective lens. This lesson describes how to use the magnification formula to calculate the magnification or the actual size in a range of units. Cells. To calculate magnification, use the following formula: magnification = the height of the image ÷ by the height of the object. 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