Teaching Physics with the Physics Suite

Edward F. Redish

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The Magnifying Glass

A magnifying glass is a converging lens used so that the object observed is closer to the lens than the focal point. An example is shown in the figure below.

a) On the figure, draw a ray diagram that will help you identify where the image is located.

b) Is the image real or virtual? Explain why you say so.

c) The focal length is a distance of 16 cm from the lens, the object is a distance of 8 cm from the lens, and the object is 8 cm high. Calculate the location and the size of the image using the lens equations. Does your calculation agree with your drawing? If not, explain why not.

Page last modified April 9, 2009: OP40