I. Coherence
II. Same frequency
III. Same wavelength
IV. Same Intensity
Which of the conditions above are necessary to produce interference fringes?
A
I and III
B
I, II and IV
C
I, II and III
D
II and III
Verified Correct Answer: C.
Physical Principles & Numerical Solution
The necessary conditions to produce interference fringes are I (Coherence), II (Same Frequency), and III (Same Wavelength). Condition IV (Same Intensity) is not necessary.
Source: Myschool Past Questions Archive (Record #703)