Question Detail

PHY 104 Diffraction and Interference of light waves Objective Question
Take CBT

Question

Why does a bright central band (n=0) occur in Young's double-slit interference pattern?
Options
A At this point, the waves cancel out due to destructive interference.
B The path difference from the two slits is exactly half a wavelength.
C The waves travel different distances but still meet constructively.
D The path difference from the two slits is zero, leading to constructive interference.
Correct Answer
Correct Answer

Option D is the correct answer.

Detailed Explanation

Page 4 states: 'At point B in the centre of the screen, light travels the same distances P1, and P2 from each slit. The difference in path length Δρ = 0 and constructive interference results in a bright central band.'

Hint

Recall the condition for constructive interference at the very center of the interference pattern.

Question Info

Course: PHY 104
Topic: Diffraction and Interference of light waves
Type: Objective
Difficulty: Not specified
Question 517 of 947
Previous Course Details Next