Question

One of the following statements is correct. Pick out the one.

• A. Diffraction can not take place without interference
• B. Sustained interference will not take place without diffraction for non-coherent sources
• C. Interference and diffraction are the result of polarization
• D. The fringe width in Young's double slit experiment does not depends on the wave length.

Answer 1

The correct option is B Sustained interference will not take place without diffraction for non-coherent sources

Yes, diffraction without interference can be possible.

Conditions for sustained interference pattern:

1. The two sources of light must be coherent with same frequency or wavelength and with same phase or constant phase difference.

2. The two sources should preferably have the same amplitude.

3. The two sources must be very close to each other.

4. The sources should emit light waves continuously.

Hence, sustained interference will not take place.

Interference and diffraction are not the results of polarization.

Finge width in Young's double slit experiment does depend on wavelength.