4.6 Focal length of lens combinations Task
4.6 Focal length of lens combinations Task 4.6 Focal length of lens combinations Task
ResultsResultsLens in the light pathObservation on the path of the light beamsPlanoconvex lensSymmetrical biconvex lensNon-symmetrical biconvex lensLens combination 1Lens combination 2- 8 -
EvaluationEvaluationQuestion 1Determine the distance f of the point M from the individual focal points F 1, F 2, F 3, F 4and F 5(focallength) in metres (m) write the values in the corresponding line of the table below.Lens in light pathPlanoconvex lensSymmetrical biconvex lensNon-symmetrical biconvex lensLens combination 1Lens combination 2f in mnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnD in dptnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnQuestion 2In the optical industry, the value of the refractive power D for lenses combinations is given indioptres (1 dpt = 1/m). The refractive power D is given by the inverse of the focal length f:D = 1/ f.Calculate the refractive power of the lenses in dioptres and write these values in the correspondingcolumns of the table above.Question 3Is the refractive power of the combination of two planoconvex lenses larger or smaller than of theindividual lenses?- 9 -
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EvaluationEvaluationQuestion 1Determine the distance f <strong>of</strong> the point M from the individual focal points F 1, F 2, F 3, F 4and F 5(focal<strong>length</strong>) in metres (m) write the values in the corresponding line <strong>of</strong> the table below.Lens in light pathPlanoconvex <strong>lens</strong>Symmetrical biconvex <strong>lens</strong>Non-symmetrical biconvex <strong>lens</strong>Lens combination 1Lens combination 2f in mnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnD in dptnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnQuestion 2In the optical industry, the value <strong>of</strong> the refractive power D for <strong>lens</strong>es <strong>combinations</strong> is given indioptres (1 dpt = 1/m). The refractive power D is given by the inverse <strong>of</strong> the focal <strong>length</strong> f:D = 1/ f.Calculate the refractive power <strong>of</strong> the <strong>lens</strong>es in dioptres and write these values in the correspondingcolumns <strong>of</strong> the table above.Question 3Is the refractive power <strong>of</strong> the combination <strong>of</strong> two planoconvex <strong>lens</strong>es larger or smaller than <strong>of</strong> theindividual <strong>lens</strong>es?- 9 -
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