Q5DQ - University Physics with Modern Physics

Question

Would the headlights of a distant car form a two-source interference pattern? If so, how might it be observed? If not, why not?

Step-by-Step Solution

Answer

No, the headlight of a distant car would not form a two-source interference pattern as the light from the headlights is not coherent.

Step 1: Define the Interference of light.

If two different sources of light emit light waves which are coherent, monochromatic and have a constant phase difference between them. On superposition of these waves, the intensity of light gets redistributed, forming a pattern of dark and bright fringes. This phenomenon is known as Interference of Light.

Step 2: Determine would the headlights of a distant car from a two-source interference pattern.

The two headlights emit light waves which are not coherent, which is an essential condition for interference to occur. Thus, on overlapping, the interference will not take place.

Hence, the headlight of a distant car would not form a two-source interference pattern.