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DOUBLE CONVEX LENS EXPERIMENT
SPH 3U
Purpose:
1.
2.
Determine the focal length of a double convex lens.
Study the images produced by a converging lens for objects in several
different positions and compare them with predicted images.
Procedure:
1.
Draw ray diagrams to scale for each object position of the
investigation: 3f; 2f; 1.5f; O.5f.
Using a ray box, determine the focal length of the lens. Verify the
focal length using another method.
Place the candle at these locations:
i)
3x the focal length in front of the lens
ii)
2x the focal length in front of the lens
iii) 1.5x the focal length in front of the lens
Record the image characteristics.
Move the object to a distance equal to half the focal length from the
lens. Locate the image and record the characteristics. For this part you
must make sure that you look through the lens and approximate the
position of the image.
Compare each set of experimental image characteristics with its
corresponding ray diagram image characteristics and the thin lens
equation.
2.
3.
4.
5.
Discussion:
1.
2.
3.
4.
5.
\sph3U\optics\478169641
Create a table to present the results found in steps #2 - #4. Include
the comparison of the experimental image with its corresponding ray
diagram image characteristics and the thin lens equation results.
Summarize image characteristics for a double convex lens.
How does a concave mirror compare with a convex lens with respect to
the images they produce?
Do you think the mirror equation be useful for lenses? Use an example
to provide evidence.
What other method could be used to determine the focal length (or
the focal point) of a double convex lens?