4. The waves in the picture represent the peak of a
wave.
When these peaks overlap another peak, the
wave is exactly in phase.
The straight lines in the picture represent bright
spots due to the constructive interference from
the peaks and valleys overlapping.
5. Since the waves from the two slits are from the
same light source, the waves are exactly in sync
but comes out in different holes.
Therefore only a phase difference differs from
these two waves.
6. The constructive interference occurs when
dsin(theta) = m times wavelength
The destructive interference occurs when
dsin(theta) = (m+ ½) times wavelength
Where m is an interger
d is the distance between two slits.
Theta is the angle that the bright spot appears
on the screen.
8. 1. The distance between the two slits are
2.56 x 10^-5 m, the wave length is 550 nm while
m is 1. Find the angle of the constructive and
destructive points.
Practice problems
