A bright beam of light from a laser passes through a tiny pinhole on its way to a projection screen on the other side of the room. Since the beam was several millimeters in diameter, the pinhole blocks most of the beam's light. After passing through this pinhole, the remaining light (Select one)
A) forms an extremely narrow beam that illuminates only a tiny spot on the projection screen-a spot the same diameter as the pinhole.
C) spreads relatively rapidly so that it forms a rather large spot on the projection screen.
D) changes frequency and color because it experiences destructive interference inside the pinhole.
Why?
2007-04-27 06:44:01 · 2 answers · asked by freepeopleurbangirl34 1 in Science & Mathematics ➔ Physics
C) spreads relatively rapidly so that it forms a rather large spot on the projection screen.
The pin hole it's so narrow that it's close of the wavelength of visible light. So, due the refraction of light, it spreads. The refraction of light happen in the very same way every wave refracts.
IF U had TWO pin holes, then would happen interference between the two waves.
2007-04-27 07:01:32 · answer #1 · answered by Anonimo 5 · 0⤊ 0⤋
Why there is no B option in the answer?
anyway, c is the choice since the tiny pinhole acts as a light source and the light spreads out from there.
2007-04-27 14:45:49 · answer #2 · answered by Swamy 7 · 0⤊ 1⤋