Question

Assertion: The two headlights of a Maruti car can produce an interference pattern in which fringes are in circular shape.
Reason: The interference is detectable, when the waves producing interference patterns are coherent in nature.
A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
C. Assertion is correct but Reason is incorrect.
D. Assertion is incorrect but Reason is correct.

Answer 1

This question is based on a deep understanding of the concept of interference. The soap bubble, which reflects a wide range of colors when illuminated by a light source, is the most common example of light interference. Another example could be incandescent bulbs generating a wide range of frequencies of light.

Complete answer:
Interference is a phenomenon in which two waves combine to generate a new wave with a smaller, larger, or equal amplitude. Optical interference, often known as light interference, is the most prevalent type of interference. This is due to the fact that most sources create light waves in a random manner.

This means that the amplitude, frequency, and phase of light waves emitted by a source are not constant. When the waves released by two sources have the same frequency and phase difference, they are said to be coherent. The randomly phased light waves constantly produce brilliant and dark fringes at every place, causing interference from such waves.

Since the two headlights of distant vehicles have random phases, they are not coherent sources. As a result, we can't make the jones of destructive and constructive interference, in which crests and troughs superimpose or crests and crests superimpose. Even if the headlights are coherent and the distance between them is great, the interference is so dense that it is not visible.

So, we conclude that assertion is incorrect while reason is correct. So the correct answer is option D.

Note: Constructive interference occurs when the peak of one wave collides with the crest of another wave, resulting in the maximum amplitude. In destructive interference, the crest of one wave collides with the trough of another, resulting in a minimum amplitude.