Calculate the size of the image of a tree that is 8m high and 80 m a pinhole camera that is 20 cm long . what is its magnification?

1) Size of the image: 2 cm

In order to calculate the size of the image, we can use the following proportion:

where

p = 80 m is the distance of the tree from the pinhole

q = 20 cm = 0.2 m is the distance of the image from the pinhole

= 8 m is the heigth of the object

is the height of the image

By re-arranging the proportion, we find

2) Magnification: 0.0025

The magnification of a camera is given by the ratio between the size of the image and the size of the real object:

so, in this problem we have

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