An object is placed at a distance of 50
cm from a concave lens. The image is
formed at a distance of 20 cm from the
lens. Find the focal length of the lens:
(a) -32.3 cm (b)-33.3 cm
(c)-36.3 cm (d) - 30.3 cm
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points A, B, C, D, E on the sketch below (spacings BC, CD, etc. are all 10 cm). ... at a point A, at a distance of 2.5 cm from the charge q is shown in ... A cubic box of side L=20 cm is placed in an electric field as shown.
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