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Presentation transcript:

Spot the mistake!

BY THE END OF THE LESSON: Take a series of results to compare distances and heights in image formation. Be able to make links between these distances/heights and the magnification of lenses. Consider and evaluate the uncertainties involved in the experiment.

Learning Objectives Take a series of measurements to allow you understand how to calculate Magnification. Practise using the lens equations. Tuesday, 23 April 2019 4

Learning Outcomes Take a series of results to compare distances and heights in image formation. Be able to make links between these distances/heights and the magnification of lenses. Consider and evaluate the uncertainties involved in the experiment. Grade E Grade C Grade A Tuesday, 23 April 2019 5

Investigating magnification... Using the following pieces of information, complete 2 ray diagrams and then do the following: For each diagram, measure & record the following: v (image distance) hi (image height) ho (object height) INFO: Scenario 1. Scenario 2 f = 4cm f = 5.5cm u = -2cm u = -2cm What links can you find between the distances and the heights of the objects and images? Can you produce an equation linking these things? NB: THERE WILL BE SOME UNCERTAINTIES HERE BY THE END OF THE LESSON: Take a series of results to compare distances and heights in image formation. Be able to make links between these distances/heights and the magnification of lenses. Consider and evaluate the uncertainties involved in the experiment.

Lenses and magnification For a fixed object distance, the greater the power of the lens, the greater the magnification. BY THE END OF THE LESSON: Take a series of results to compare distances and heights in image formation. Be able to make links between these distances/heights and the magnification of lenses. Consider and evaluate the uncertainties involved in the experiment.

Magnification at GCSE What does magnification actually mean? If the image is magnified 2 x…… Image height = Object height x 2 MAGNIFICATION = IMAGE HEIGHT OBJECT HEIGHT BY THE END OF THE LESSON: Take a series of results to compare distances and heights in image formation. Be able to make links between these distances/heights and the magnification of lenses. Consider and evaluate the uncertainties involved in the experiment.

IF YOU WOULD LIKE TO SEE THE PROOF BY THE END OF THE LESSON: Take a series of results to compare distances and heights in image formation. Be able to make links between these distances/heights and the magnification of lenses. Consider and evaluate the uncertainties involved in the experiment. Magnification Magnification is a measure of how much an image has been enlarged by a lens. It can be calculated from the heights of the image and object but also by the distances u and v. To do this.... M = v u IF YOU WOULD LIKE TO SEE THE PROOF

Investigating Magnification Starting with u = 1m and gradually reducing it in equal steps so that in turn v changes. Investigate how v affects the image height. Record v and image height and then plot a line graph of your results. BY THE END OF THE LESSON: Take a series of results to compare distances and heights in image formation. Be able to make links between these distances/heights and the magnification of lenses. Consider and evaluate the uncertainties involved in the experiment.

Sample results image distance / x10-2m image height / x10-2m 18.5 0.35 20.0 0.45 22.0 0.50 23.5 0.60 27.0 0.70 30.0 0.80 37.0 1.10 45.0 1.50 56.0 2.00 Plot a graph of image distance on the x-axis against image height on the y-axis BY THE END OF THE LESSON: Take a series of results to compare distances and heights in image formation. Be able to make links between these distances/heights and the magnification of lenses. Consider and evaluate the uncertainties involved in the experiment.

Thinking about magnification… copy and complete: If M is... The image will be ..... Positive and > 1 Negative and > 1 < 1 =1 = 0 BY THE END OF THE LESSON: Take a series of results to compare distances and heights in image formation. Be able to make links between these distances/heights and the magnification of lenses. Consider and evaluate the uncertainties involved in the experiment.

Using our graph to find focal length. What is the significance of our x-intercept? No image height What does that mean in terms of magnification? No magnification If we know m=0, what does this mean for v and f? HINT: Think back to lens diagrams from Y11 BY THE END OF THE LESSON: Take a series of results to compare distances and heights in image formation. Be able to make links between these distances/heights and the magnification of lenses. Consider and evaluate the uncertainties involved in the experiment.