A yellow light from a sodium lamp has 2 wavelength components namely 589 nm and 589.59 nm. Refractive index 'n' of the dispersive medium with respect to both These wavelengths are 1.6351 and 1.6350 respectively. Define: (a) The phase velocities of the two waves in the glass (b) Velocity of the wave group transmitted through the glass.

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Interference of Light

The word "constructive" signifies addition in interference. Constructive interference occurs when the path of the waves that start from the slit differs by 1 entire wavelength or in the intervals of the same. Hence, the waves that are presented on the screen are in phase (crest to crest/trough to trough). The waves interfering constructively forms bright fringes on the screen.