Question

distinguish between point source of light and extended source of light​

Answer 1

Answer:

A shadow formed by a point light source such as a flashlight is called an umbra. It is uniformly dark and has sharp, well-defined edges. A shadow formed by an extended light source such as a fluorescent light tube has a central dark umbra surrounded by a lighter penumbra region. The inner and outer edges of the penumbra are blurry and poorly defined.