A tree with a height of 20m, is located at a distance of 200m from the camera lens.

A tree with a height of 20m, is located at a distance of 200m from the camera lens. If the focal length of the lens is 50mm, then the height of the tree on the negative is.

H is indicated by a height of 20 meters. d is indicated by a distance of 200 m. F will be 0.05. Then we solve according to the main formula: 1 / F = 1 / d + 1 / f. The following formula is: 1 / f = 1 / F – 1 / d. Third formula: f = dF / d-F Then this one: f = 200 * 0.05 / 200-0.05 = 0.05 M; H / h = d / f. Most recent formula: h = f * H / d = 0.05m = 5mm

First formula 1 / F = 1 / d + 1 / f: thin lens formula.

The answer to the problem will be 5 mm.