Question

1)What are essential conditions for two light waves to be coherent?
2)What is the shape of interference fringes in YDSE?

answer both

Answer 1

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• ESSENTIAL CONDITIONS ARE

1. LIGHT WAVES MUST HAVE SAME FREQUENCY WAVELENGTHS .
2. THEY SHOULD HAVE ZERO OR CONSTANT PHASE DIFFERENCE.

• THE FRINGES ARE NEARLY STRAIGHT LINE FRINGES PARALLEL TO THE SLITS.

Answer 2

☆$\red {HELLO\:DEAR}$☆

1.What are essential conditions for two light waves to be coherent?

1. To set up a stable and clear interference pattern, two conditions must be met:
2. The sources of the waves must be coherent, which means they emit identical waves with a constant phase difference.
3. The waves should be monochromatic - they should be of a single wavelength.

2.)What is the shape of interference fringes in YDSE?

The theoretical shapes of the interference fringes observed in Young`s double slit experiment are straight lines which is easily proved.

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