Question

Assertion : No interference pattern is detected when two coherent sources are infinitely close to each other.

Reason : The fringe width is inversely proportional to the distance between the two slits.

A) If both assertion and reason are true and the reason is the correct explanation of the assertion.
B) If both assertion and reason are true but reason is not the correct explanation of the assertion.
C) If assertion is true but reason is false.
D) If the assertion and reason both are false.
E) If assertion is false but reason is true.

Answer 1

The assertion and reason given are both incorrect. Interference patterns can still be observed when two coherent sources are very close together. The fringe width is determined by the wavelength of the light and the distance between the slits.

Step-by-step explanation:

The assertion that no interference pattern is detected when two coherent sources are infinitely close to each other is incorrect. Interference patterns can still be observed even when the sources are very close together. The reason given, that the fringe width is inversely proportional to the distance between the two slits, is also incorrect. The fringe width is actually determined by the wavelength of the light and the distance between the slits.

Interference patterns are produced when light from two coherent sources, such as the two slits in a double-slit experiment, overlap and interfere with each other. The interference pattern consists of alternating bright and dark fringes.

The spacing of the fringes depends on the wavelength of the light used and the distance between the slits. When the distance between the slits is decreased, the fringes become closer together and the fringe width decreases. However, even if the slits are infinitely close, there will still be interference between the waves from the two sources, resulting in an interference pattern.