Question Detail

PHY 104 Diffraction and Interference of light waves Objective Question
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Question

When does a bright central band occur in Young's experiment?
Options
A When the path difference is a half-integer multiple of the wavelength.
B When the path difference is zero.
Correct Answer
C When the path difference is equal to the slit separation.
D When the light is unpolarized.
Correct Answer

Option B 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

Consider the conditions for constructive interference and the geometry 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 535 of 947
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