4.6 Focal length of lens combinations Task
4.6 Focal length of lens combinations Task 4.6 Focal length of lens combinations Task
SetupSetupAttentionTake care that the lenses lie with their flat sides precisely on the perpendicular of the crossedlines and that their position does not change during the experiment.Draw crossed lines at right angle to each other in the middle of your sheet of paper. Theintersectionof the lines is point M.Make two marks, one on either side of M, at a distance of 3 cm away from M.Fig. 1Lay the planoconvex lens (rough side downwards) with the flat side precisely on the perpendicularline within the two marks.Insert the three-slit aperture in the light box on the lens side and position this about 10 cm fromthe plane edge of the block.Fig. 2- 4 -
ActionActionConnect the light box to the power supply (12 V AC).Fig. 3Move the light box and, if necessary, the lens carefully until the middle light beam travels preciselyalong the optical axis and on passing the lens is not refracted.Observe the course of the parallel light beams on passing through the lens and note yourobservations in the table on the results page.Fig. 4Mark the position of the focal point on the optical axis and label it F 1.- 5 -
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ActionActionConnect the light box to the power supply (12 V AC).Fig. 3Move the light box and, if necessary, the <strong>lens</strong> carefully until the middle light beam travels preciselyalong the optical axis and on passing the <strong>lens</strong> is not refracted.Observe the course <strong>of</strong> the parallel light beams on passing through the <strong>lens</strong> and note yourobservations in the table on the results page.Fig. 4Mark the position <strong>of</strong> the focal point on the optical axis and label it F 1.- 5 -
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