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In a double-slit experiment, green light (5303 Å) falls on a double slit having a separation of 19.44 m and a width of 4.05 m. The number of bright fringes between the first and the second diffraction minima is:


Question ID - 50349 :-

In a double-slit experiment, green light (5303 Å) falls on a double slit having a separation of 19.44 m and a width of 4.05 m. The number of bright fringes between the first and the second diffraction minima is:

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Answer Key : (5) -

For  diffraction location of  1st  minima

y1 =  = 0.2469D                                                                   Q                               

location of 2nd minima                                                                                  

                                                           

y2 =  =0.4938D                                                                     

Now for interference Path difference at P.

 = 4.8

path difference at Q

 = 9.6

So orders of maxima in between P & Q is 5, 6, 7, 8, 9

So 5 bright fringes all present between P & Q.



Next Question :

The intercepts on the straight line  by the line  and  is less than 5, then  belongs to

a)

b)

c)

d)


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