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Solution


Q.

In Young’s double slit experiment, if we increase the separation between the plane of slits and the screen by keeping everything constant, then
1 Intensity of central maxima will increase but fringe width will decrease  
2 Intensity of central maxima will decrease but fringe width will increase  
3 Both intensity of central maxima and fringe width will increase  
4 Both intensity of central maxima and fringe width will decrease  

Ans.

(2)

Use the basic concept of interference of light waves.