Solved Problems

1.    Two coherent sources of intensity 10 w/m2 and 25 w/m2 interfere to from fringes. Find the ratio of maximum intensity to minimum intensity.


[May 2004, Set No. 1; May 2003, Set No. 2]

Sol: We know the intensity (I) = a2 [square of amplitude]


Ratio of Imax to Imin is


2.    In a double slit experiment a light of λ = 5460 Å is exposed to slits which are 0.1 mm a part. The screen is placed 2 m away from the slits. What is the angular position of the 10th maximam and 1st minimum?


[June 2005, Set No. 3]

Sol: The ...

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