The question is about formation of shadows by objects
2006-07-31 23:03:29 · 7 answers · asked by animesh d 1 in Science & Mathematics ➔ Physics
Shadow means there is difference in brightness in the shadow region and out side. If the variation of brightness is small, we can't distinguish the shadow.
In an extended source of light like sun, moon, tube light etc, the light from different parts of the source may fall on the region where we expect a shadow.
Close your one eye. Now keep a small coin very near to the other eye so that it completely hides a tube light.
We are not able to see the tube light because our eye is in the shadow region of the coin.
Now move the coin toward the light; slowly we are able to the two ends of the tube light and gradually almost much of the tube light will be visible.
This shows that in an extended source of light, light will fall even in a region where we expect a shadow.
On new moon day the moon is in the direction of the sun. But the moon is not visible to our eye because of the high bright back ground of extended source of sun’s light.
If moon were big enough to hide the sun we will have a shadow or darkness during new moon day even during the expected day time.
2006-08-01 01:08:02 · answer #1 · answered by Pearlsawme 7 · 0⤊ 0⤋
When we stand in the sunlight, some of the light is stopped while other rays pass on in a straight-line path.
A shadow is formed where light ray can not reached.
Thus, a bird that flies at such a high magnitutde, stops some light rays, but not all. Also, the distance between the bird and the ground is so big that many more light rays touch the ground instead of the rays that were stopped by the bird, so no shadow is formed.
2006-07-31 23:10:30 · answer #2 · answered by mommy_mommy_crappypants 4 · 0⤊ 0⤋
You will get some light bending around the bird due to diffraction and, depending on the size of the bird and how high it is flying, the bird might not be big enough to cast a significant shadow.
Imagine taking a large flashlight (with about a 4" reflector), shine it against the wall about 4' away, and put your finger up in front of it about half way to the wall. The finger is not big enough to eclipse the flashlight at any point on the wall.
2006-08-01 04:39:36 · answer #3 · answered by Somewhere in Iraq 2 · 0⤊ 0⤋
i dont know but we can see the shadow of a standing bird
2006-07-31 23:12:23 · answer #4 · answered by viswanathansri 2 · 0⤊ 1⤋
This is not necessarily true. I have seen before. It probably depends on the height the bird is flying.
2006-07-31 23:34:34 · answer #5 · answered by papyrus 4 · 0⤊ 0⤋
yes shadow is there
2006-07-31 23:39:26 · answer #6 · answered by corrona 3 · 0⤊ 1⤋
who said we cant? i hav seen
2006-07-31 23:31:25 · answer #7 · answered by friend 3 · 0⤊ 1⤋