Image location Consider two glass lenses A and B with unknown radii of curvature. Nevertheless, the two lenses are known to have the same curvature on one side. When lens A is tested and rays propagate from the side of identical curvature at a distance of

20cm, the image is at a distance of 40 cm. When lens B is tested and rays propagate from the side of identical curvature at a distance of 80 cm, the image is at a distance of 40 cm. Determine the location of the image when the two lenses are merged together along the identical curvature side and rays propagate from the side of lens A at a distance of 30 cm.

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T (transmitter) h d' d" Figure 3.15 Near-ground radio propagation. R (receiver) h