hi all...it is said that constructive interference happens when the path difference is nlambda and i think wavelength,frequency and amplitude of light going through both slits is the same then
why is the central maxima is the brightest spot?
why the brightness decreases when n increases?
Since the amplitude is same why there is difference in the brightness of the bright fringes?
2007-08-31 00:06:27 · 3 answers · asked by Anonymous in Science & Mathematics ➔ Physics
Constructive interference gives the sum of the waves and it combines.
For example if you have two waves each described by sin(x) then constructive interference gives a single wave of sin(x)+sin(x) = 2sin(x)
2007-08-31 00:31:34 · answer #1 · answered by SS4 7 · 0⤊ 0⤋
As the 2nd answer said, intensity decreases as the square of the distance. It also decreases as the cosine of the angle from normal. Both of these effects are working to decrease the brightness off center.
2007-08-31 07:52:34 · answer #2 · answered by kirchwey 7 · 0⤊ 0⤋
when u shine a torch on a wall the brightness decreases radially away from centre...u are forgetting an important concept..Intensity..intensity decreases as the square of distance from the centre..
2007-08-31 07:41:51 · answer #3 · answered by Anonymous · 0⤊ 0⤋