An airplane flying at an altitude of 820m. above the ground took picture of a tower. The image of the top and bottom of the tower appears in the picture having distances of its end of 2.08cm. and 2.00cm. from the center of the photograph.

What is the height of the tower?

If the focal length of the camera is 150mm., how far is the tower from the plane along the horizontal?

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\[
d = \frac{r h}{H}
\]
\[
d = r_t – r_b
\]
\[
d = 2.08cm. – 2.00cm.
\]
\[
d = 0.08cm.
\]
\[
0.08cm. = \frac{2.08cm. h}{820m.}
\]
\[
h = 31.53846153846154m.
\]
\[
h \approx 31.54m. \leftarrow \text{answer}
\]