Question

Explain why, we often see bright circular patches of light on the ground under tree on a sunny day

Answer 1

The bright circular patches of light under the tree is called pinhole images, the source of the light is the sun, the dry porous leaves and the gaps between the leaves acts as the screen, and the phenomenon is known as diffraction of lights.

Answer 2

It is a common event and the simple reason behind the phenomena is supported by physics, which can decipher it in detail.

These spots seen are the pinhole images of the light source sun and it is created due to the sunlight traveling and deflecting via the small holes between leaves and tree branches.

This is the same old principle by which timeworn pinhole cameras were used.