After light from a source passes through two slits,a first-order bright spot is seen on the wall at point P.Which distance is equal to the wavelength of the light?
A)the extra distance one beam must travel
B)the distance between beams as they leave the slit
C)the distance of point P from the central point of the interference pattern
D)the distance between slits

Question

After light from a source passes through two slits,a first-order bright spot is seen on the wall at point P.Which distance is equal to the wavelength of the light? 
A)the extra distance one beam must travel 
B)the distance between beams as they leave the slit 
C)the distance of point P from the central point of the interference pattern 
D)the distance between slits

Quizplus · Accepted Answer

The first-order bright spot is produced by the interference of the two beams of light that pass through each of the two slits. The bright spot represents a point on the wall where the path difference between the two beams of light is equal to one wavelength. This path difference is equal to the extra distance that one beam of light must travel compared to the other beam of light in order to reach point P, which is located at the same distance from both slits. Therefore, the distance that is equal to the wavelength of the light is the extra distance that one beam must travel.

After Light from a Source Passes Through Two Slits,a First-Order