What is meant by interference of light? In a double slit experiment with monochromatic light, fringes are obtained on a screen placed at some distance from the slits. If the screen is moved by 5 × 10 –2 m towards the slits, the change in fringe width is 3 × 10 –5 m. If the distance between slits is 10 –3 m, calculate the wavelength of light used.
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Sol. The phenomenon of redistribution of energy due to superposition of waves from two coherent sources is called interference.
β 1 = 
& β 2 = 
∴ β 1 – β 2 = 
or, λ = 
= 
= 6 × 10 –7 m
= 6000 Å
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