Light and shadows · प्रकाश और छाया
A free Physics lesson for Class 3 children.
We need light to see things.
The Sun is our biggest source of light.
A bulb, a candle and a torch also give light.
The Moon has no light of its own. It shines with the light of the Sun.
Light travels in a straight line.
When a thing blocks light, a dark shadow forms behind it.
Shadows are long in the morning and evening. They are short at noon.