Optics Question 1014
Question: Two sources of waves are called coherent if
[NCERT 1984; RPET 2003; MP PMT 1996, 2004]
Options:
A) Both have the same amplitude of vibrations
B) Both produce waves of the same wavelength
C) Both produce waves of the same wavelength having constant phase difference
D) Both produce waves having the same velocity
Show Answer
Answer:
Correct Answer: C
Solution:
Two coherent source must have a constant phase difference otherwise they can not produce interference.
