Question

how will you calculate the heigh of
a tree when using a pinhole camera​

Answer 1

$<font color = gold>$

This is also a reasonable estimate for the height of the tree if the pinhole is near the top of the canopy. But where does the factor of 108 come from? The angular diameter of the Sun as seen at the surface of the Earth is about 0.53 degrees of arc or 1/108 radians.