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State the importance of coherent sources...

State the importance of coherent sources in the phenomenon of interference. In Young's double slit expet-ment to produce interference pattern obtain the conditions for constructive and destructive interference. Hence deduce the expression for the fringe width. How does the firinge width get affected, if the entire experimental apparatus of Young's is immersed in water ?

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The figure shows a modified Young's double slit experimental set-up. Here SS_(2)-SS1=lamda//4. (a) Write the condition for constructive interference. (b) Obtain an expression for the fringe width.

The figure shows a modified Young’s double slit experimental set-up. Here S S_(2)-S S_(1)=lambda//4 . (a) Write the condition for constructive interference. (b) Obtain an expression for the fringe width.

If Young's double-slit experiment is performed under water, how would be observed interference pattern be affected ?

Statement-I : In Young's double slit experiment interference pattern dissapears when one of the slits is closed Statement-II : Interference is observed due to superposition of light waves from two coherent source