Question Detail
Question
What principle is responsible for alternating light and dark bands when light passes through two or more narrow slits?
Correct Answer
Option D is the correct answer.
Detailed Explanation
When light passes through two or more narrow slits, the waves diffract (spread out) from each slit. These diffracted waves then overlap and combine, leading to regions where they constructively interfere (producing bright bands) and regions where they destructively interfere (producing dark bands). This phenomenon of alternating bright and dark bands is known as interference.
Hint
Think about what happens when waves from different sources overlap and combine.