The shadow formed by the point source of light has a screen blocking it. So it is very precise and only forms an umbra. Whereas the other is not as precise and forms an umbra and a penumbra.
because its main source that gives it to light is one of the main source of light
The moon is not a source of light because it simply reflects the suns light, therefore it is not a direct source of light
the sun is the primary source of light
The flame of a candle is a source of light.
it is helping somes people
extende source is required to get nearly parallel rays of light
Either, depending on the situation. If you look at it from far away, the light seems to come from a single direction, and can be simplified as a point-source. If you are very close, the light comes from different directions, and such a simplification is no longer correct.
The rings may formd but the lack of intensity of light,the dark and light rings are not vissiable very well..
The shadow formed by the point source of light has a screen blocking it. So it is very precise and only forms an umbra. Whereas the other is not as precise and forms an umbra and a penumbra.
light source
It is a light source.
light source
The Sun is a light source Something that makes light.
It is certainly a source of light but it is not a practical, usable source.
because its main source that gives it to light is one of the main source of light
Luminous light is a light source but another name for it.